HomeMy WebLinkAbout950796.tiff ' FINAL READING 37
y/ FEB 9 1981
Recorded at ��..� o'cbck ._ -.M.. ..—'—_"'
e�� 927 1849202Rec. No. ," n
~�Y ,, tied. L,
6).3 / Ad
State of Colorado, Weld County Clerk & Recorder
ORDINANCE NO. 9—A
c.�
IN THE MATTER OF THE REPEAL AND RE-ENACTMENT WITH AMENDMENTS
OF ORDINANCE NO. 9 , CONCERNING THE ADOPTION OF RULES AND REG-
ULATIONS FOR INDIVIDUAL SEWAGE DISPOSAL SYSTEMS IN WELD COUNTY .
O
BE IT ORDAINED BY THE BOARD OF COUNTY COMMISSIONERS OF WELD
COUNTY , COLORADO:
WHEREAS , Ordinance No . 9 , an Ordinance containing changes
and amendments to the Weld County Individual Sewage Disposal
System Regulations , was previously passed and adopted on the
27th day of June, 1977 , and
r
nn
WHEREAS, pursuant to the provisions of 25-10-101 , et seq. ,
C .R.S . 1973 , as amended, the County of Weld is required to
adopt rules and regulations concerning individual sewage dis-
posal systems in the County of Weld, and
WHEREAS , the Weld County Board of Health has recommended
the adoption of a comprehensive revision of said rules and
regulations , and
WHEREAS, the Board of County Commissioners of the County
of Weld, State of Colorado, desires to repeal and re-enact with
amendments Ordinance No. 9 for the benefit of the inhabitants
of Weld County and for the promotion of their safety , welfare ,
convenience and prosperity.
NOW, THEREFORE, BE IT ORDAINED by the Board of County Com-
missioners of Weld County, Colorado that Ordinance No . 9 pre-
viously enacted be, and hereby is , repealed and re-enacted
with amendments to read as set forth in Exhibit A, "Weld County
Individual Sewage Disposal System Regulations" , a copy of which
is attached hereto and incorporated herein by reference.
The effective date of this Ordinance shall be forty-five
(45) days after the final _)ublication of this Ordinance.
,
950 796
Boo 927 K 1849202
to3-a.
The above and foregoing Ordinance No. 9-A was , on motion
duly made and seconded, adopted by the following vote on the
9th day of February , A.D. , 1981 .
BOARD OF COUNTY COMMISSIONERS
WELD COUNTY, COLORADO
O (---)„..z..„......___
c.
) 4, •
ATTEST: `t fC.i:.lf ,,...4,n i•;.,' 1 ^:r f'YG/ jf ' C��7 'D7,7l�l6C
Weld County Clerk and Recorder
anc Clerk to the Bo r
n
By. :2 (n0MOdiir-0p I Li _
nieputy County erk
AP #R D AS'TO FORM: ��
County Attorn'
PRESENTED: FEBRUARY 9, 1981
PUBLISHED: FEBRUARY 13, 1981
Boo
K 927EXHIBIT A 1849202
WELD COUNTY
INDIVIDUAL SEWAGE DISPOSAL SYSTEM
REGULATIONS
INDEX
SECTION I : TITLE AND POLICY 1
SECTION II : DEFINITIONS 1
SECTION III: ADMINISTRATION AND ENFORCEMENT 7
SECTION IV: GENERAL TECHNICAL REQUIREMENTS 19
SECTION V: REQUIREMENTS FOR SEPTIC SYSTEMS 25
SECTION VI : REQUIREMENTS FOR EVAPOTRANSPIRATION
SYSTEMS 34
SECTION VII : REQUIREMENTS FOR ALTERNATE DISPOSAL
SYSTEMS 35
SECTION VIII: EFFLUENT DISCHARGED DIRECTLY TO WATERS
OF THE TATE 37
SECTION IX: NEW OR EXPERIMENTAL DESIGNS 37
APPENDICES: SUMMARY 39
ADOPTED:
_X-
•
d°°1(92'7 • 1849202
(03 - �1
SECTION I : TITLE AND POLICY
1,1 TITLE: These regulations shall be known as the Individual Sewage Disposal
Regulations.
1.2 POLICY: The Weld County Board of Health and the Weld County Board of County
Commissioners declare the purpose of this regulation is to preserve the envi-
ronment and protect the public health; to eliminate and control the causes of
disease, infection, and aerosol contamination; and to reduce and control the
pollution of the air, land and water; it is declared to be in the public in-
terest to establish minimum standards, rules and regulations for individual
sewage disposal systems in the County of Weld and to provide the authority
for the administration and enforcement of such minimum standards, rules and
regulations. These regulations are designed to control the construction, lo-
cation and operation of sewage disposal systems, the transportation and final
disposal of sewage materials and the control of Systems Contractors and Systems
Cleaners of such systems. The Weld County Board of Health and the Weld County
Board of County Commissioners declare that its general policy is to require the
use of public sewer systems where and whenever feasible, and to limit the
installation of individual sewage disposal systems only to areas that are not
feasible for public sewers. These regulations shall apply to all individual
sewage disposal systems and to sewage treatment works which are not required
to comply with the provisions of the Water Quality Control Act, 25-8-101,
et seq. , CRS 1973. These rules and regulations shall meet or exceed the
requirements of the guidelines as adopted by the Colorado Board of Health
pursuant to 25-10-104, CRS 1973 .
SECTION II : DEFINITIONS: The following definitions shall apply in the interpreta-
tion and enforcement of this Regulation. The word "shall" as used herein
indicates a mandatory requirement.
2.1 Absorption System: a leaching field and adjacent soils or other system for the
treatment of sewage in an individual sewage disposal system by means of absorp-
tion into the ground.
2.2 Absorption Trench: one or more trenches not over three feet in width and of
varying length and depth in which sewage effluent is percolated into the soil.
2.3 Acceptable Design: a standardized design of tank, plant or system, the instal-
lation of which is permitted by the Department, provided that site requirements
are met.
2,11 Aeration Plant: equipment or devices for the aerobic treatment of sewage.
2,5 Aerobic Sewage Treatment System: an individual sewage disposal system employing
biological action which is maintained by the addition of air or oxygen.
2.6 Analytical Parameters:
A. Temperature (T) : the measure of the thermal state of substance with
respect to its ability to communicate heat to its environment reported
as degree Centigrade (C) .
-1-
b"`' 927 1849202
63 - s
2.6 ANALYTICAL PARAMETERS
B. Suspended Solids (SS) : Solids in the sewage that can be removed readily
by standard filtering procedures in a laboratory reported as milligrams
per liter (mg/1) .
C. Volatile Suspended Solids (VSS) : The quantity of solids in sewage which
are lost on ignition of the dry suspended solids at 600C. reported as
percent of total suspended solids.
D. Settleable Solids: Solids in the sewage which will settle, as distinct
from remaining in suspension reported as millileters per litter of sample
after 30 minutes of settling time (ml. 30 min. ) .
S. pH: The logarithm of the reciprocal of the hydrogen ion concentration.
F. Dissolved Oxygen (DO) : The oxygen dissolved in sewage reported as
milligrams per liter (mg. 1) .
G. Chemital Oxygen Demand: Is the measure of the oxygen equivalent
of that portion of organic matter that can be oxidized by a strong
chemical oxidizing agent and reported as milligrams per liter (mg/1) .
H. Five Day Biochemical Oxygen Demand (BOGS) : The quantity of oxygen
used in the biochemical oxidation of organic matter in five days at
20° C under specified conditions reported as milligrams per liter
(mg/1) .
2.7 Applicant: any person who submits an application for a permit for an
individual sewage disposal system.
2.8 Approved: official consent given in writing by the Department.
2.9 Bedrock: the more or less solid undisturbed rock in place either at the
surface or beneath surficial deposits of gravel, sand, or soil or a consoli-
dated rock formation of impervious material which may exhibit jointed, fractured,
or deteriorated characteristics.
2.10 Board of Health: the Board of Health as designated by the Board of County
Commissioners of Weld County, Colorado.
2,11 Building Sewer: that part of the piping of a drainage system which extends
from the end of the building drain and which receives the discharge of the
building drain and conveys it to a public sewer, private sewer, individual
sewage disposal system or other point of disposal.
2. 12 Cesspool: a covered underground receptacle which receives untreated sewage
from a building and permits the untreated sewage to seep into surrounding soil.
2._3 Cistern: a water-tight covered receptacle of non-toxic materials which is
:o si fined for storage of potable water.
-1-
"" 92'7
1849202
(03 - G
2.31 Individual Sewage Disposal System and the term "System": a system or facility
for treating, neutralizing, stabilizing or disposing of sewage which is not
a part of or connected to a sewage treatment works.
2.32 Lift Station: a device used for the vertical lifting of effluent to the
required horizontal level of either the absorption field or septic tank.
2.33 Liner: a watertight membrane liner of at least 0.01 (10 mil) thickness
which is used to prevent effluent from entering the soil or groundwater
table. Material shall be polyvinyl chloride or material of equal integrity.
2,34 Manufacturer: the person or firm that constructs or assembles individual
sewage treatment system components.
2,35 Matrix: the material in which effluent is dispersed for percolation or
capillary action.
2.36 Mini-System: a system designed to accommodate wastes only from sinks,
lavotories, tubs, showers or laundries.
2.37 Owner: the person who is owner of record for the land on which an individual
sewage disposal system is to be designed, constructed, installed, altered,
extended or used.
•
2,38 Percolation Test: a subsurface soil test at the depth of a proposed
absorption system or similar component of an individual sewage disposal
system to determine the water absorption capability of the soil, the
results of which are normally expressed as the rate at which one inch of
water is absorbed.
2.39 Permeability: the property of a material which permits movement of water
through the material.
2.40 Permit: a permit for the construction or alteration, installation and use or
for the repair of an individual sewage disposal system.
2.41 Person: individual, partnership, firm, corporation, association or other
legal entity and also the state, any political subdivision thereof or other
governmental entity.
2.42 Plot Plan: an accurate drawing or map indicating the dimensions, acreage, and
location of property lines, buildings, wells, individual sewage disposal systems,
water courses, geographical features and other pertinent information as required.
2.43 Privy: a structure allowing for the disposal of excreta not transported by
a sewer and which provides privacy and shelter and prevents access to the excreta
by flies, rodents or other animals.
2,1414 Registered Professional Engineer: an engineer licensed in accordance with 12-25-111
CRS 1973.
927
1849202
6.3 - 7
2.14 Competent Technician: an employee of the Department who is able to conduct
and interpret the results of percolation tests.
2,15 Component Parts: all physical, mechanical and electrical components of
an aeration plant.
2.16 Composting Toilet: a unit which consists of a toilet seat and cover over
a riser which connects to a compartment or vault that contains or will
receive composting materials sufficient to reduce waste by aerobic
decomposition.
2.17 Contact Basin: a water tight receptacle used for the retention of effluent
for a specified length of time so that required biological or chemical
action can occur.
2.18 Department: the Weld County Health Department.
2.19 Dispersal System: a system for the disposal of effluent, after final
treatment in an individual sewage disposal system, by a method which does
not depend upon or utilize the treatment capacity of the soil.
2,20 Distribution Box: a water-tight chamber below the outlet level of a septic
tank or treatment unit and from which effluent enters the absorption system.
2,21 Division: the Division of Environmental Health Services, Weld County Health
Department.
2.22 Dosing Tank: a tank which provides for a high rate, periodic discharge of
effluent.
2.23 Effluent: the liquid waste discharge from an individual sewage disposal
system.
2,24 Environmental Health Specialist: a person who is trained in physical,
biological and sanitary science to carry out inspectional and educational
duties in the field of environmental health.
2.25 Evapotranspiration System: a type of dispersal system that wholly or
primarily utilizes liquid evaporation or transpiration by vegetation as
a means of effluent disposal.
2.26 Experimental System: a new device or design in which further testing is
required in order to provide sufficient information before acceptance.
2.27 Geologist: a Professional Geologist as defined in 6-5-102, CRS 1973.
2.28 Groundwater Table: the upper surface of ground water in the zone of
saturation of a geologic formation.
2.29 Health Officer: the chief administrative and executive officer of Weld
County Health Department or designated agent .
2.30 Holding Tank: a water-tight receptacle for the retention of sewage either
before, during or after treatment.
-4-
`3°°K 92'7 1849202
2.45 Sand Filter: a subsurface system which utilizes filtration or absorption or
both, which contains an intermediate layer of sand as filter material.
2.46 Seepage Bed: absorption bed means a subsurface soil absorption area which
is wider than three(3) feet, together with a system of perforated distribution
pipes through which effluent may seep or leach into the soil.
2,47 Seepage Pit: a type of soil absorption system dependent upon suitable soil at
a depth greater than that of an absorption trench or bed, and designed on the
basis of sidewall area.
2.48 Septic Tank: a watertight, accessible, covered receptacle designed and constructed
to receive sewage from a building sewer, to settle solids from the liquid, to
digest organic matter and store digested solids through a period of retention and
allow the clarified liquids to discharge to other treatment units for final
disposal.
2.49 Serial Distribution: an arragement of absorption trenches, seepage pits or
seepage beds so that effluent is retained in each successive component before
flowing into the succeeding component.
2. 50 Sewage: a combination of liquid wastes which may include chemicals, house wastes,
human excreta, animal or vegetable matter in suspension or solution, and other
solids in suspension or solution, and which is discharged from a dwelling, building
or other establishment.
2.51 Sewage Treatment Works: a system or facility for treating, neutralizing, stablizing
or disposing of sewage, which system or facility has a designed capacity to receive
pure than two thousand gallons of sewage per day. The term "sewage treatment works"
includes appurtenances such as interceptors collection lines, outfall and outlet
sewers, pumping stations and related equipment.
2.52 Stabilization Pond: a reservoir or diked land which receives aeration plant effluent for final treatment or evaporation.
2.53 State Waters: any and all surface and subsurface waters which are contained in or
flow in or through this state, except waters in sewerage systems, waters in treatment
works of disposal systems, waters in potable water distribution systems and all waters
withdrawn for use, until all uses and treatment have been completed.
2. 54 Suitable Soil: a soil which will effectively filter effluent by removal of organisms
and suspended solids before the effluent reaches any highly permeable earth such as
joints in bedrock, gravels or very coarse soils and which meets percolation test
requirements and ahs a vertical thickness of at least four feet.
[, 55 Systems Cleaner: a person engaged in and who holds himself out as a specialist
in the cleaning and pumping of sewage disposal systems and removal of the residues
deposited in the operation thereof.
2.56 Systems Contractor: a person engaged in and who holds himself out as a specialist
in the installation, renovation, and repair of sewage disposal systems .
-
•
Boot(92'7 1849202
63 - 9
2.57 Uniformity Coefficient: the quotient of the grain size that is 40% coarser
by weight than itself divided by the grain size which is 90% coarser (effective
size) by weight than itself.
2,58 Vault: a watertight, covered receptacle which is designed to receive and store
sewage and is accessible for the periodic removal of its contents.
2,59 Wastewater Pond: a designed pond which receives exclusively wastewater from a
first stage treatment unit and which provides an additional degree of treatment.
2.60 Water Quality Control Commission: the Commission created by 25-8-201, CRS 1973.
'°"\`92'7 1849202
/o3 - 0
SECTION iii , ADMINISTRATION AND ENFORCEMENT
3,1 General Sanitation Requirements : The owner of any structure where people
live, work, or congregate shall insure that the structure contains an
adequate, convenient, sanitary toilet and sewage disposal system in good work-
ing order. Under no condition shall sewage or effluent be permitted to be
discharged upon the surface of the ground, or into Waters of the State,
unless the sewage or effluent meets the minimum requirements of this
regulation or the water quality standards of the Colorado Water Quality
Control 'Commission, whichever are applicable. Any person who is aware
of a malfunctioning septic system is encouraged to report the location of
the system to the Department.
3.2 Inspection and Right-of-Entry: Pursuant to 25-1-506 CRS 1973, as amended,
for the purpose of inspection and enforcement of applicable rules, regula-
tions and the terms and conditions of any permit issued, the Health Officer
or his designated agent is authorized to enter upon private property for the
purpose of determining whether or not individual sewage disposal facilities
are functioning in compliance with Article 10 of Title 25, CRS 1973 and
applicable rules and regulations adopted pursuant thereto. The owner or
occupant of every property having an individual sewage disposal system,
shall permit the Health Officer or his designated agent access to the
property to conduct required tests, take samples, monitor compliance,
and make inspections. If access is denied, the Health Officer or his designa-
ted agent may apply to the District Court for an order authorizing entry.
3,3 Permit application requirements:
A. Any person who wishes to install, alter, or repair an individual
sewage disposal system in Weld County, Colorado, shall first obtain,
prior to commencement of construction, a permit from the Environmental
Health Services Division, Weld County Health Department and the following
information must be provided in the permit application:
1. Legal description of the property.
2. Owner of the property.
3. Owner's mailing address and telephone number.
4. Type of building by use.
5. Type of water supply.
6. Lot size.
7. Type of services required in the structure.
S. Owner' s signature or agent with written permission to sign for the
owner.
9. Such additional information as may be required by the Division.
B. The maximum size of the lot or building site that can be used for an
individual sewage disposal system cannot exceed twenty-five(25) percent
unless a waiver has been obtained and approved by the Board of Health
for experimental or water conservation methods.
gip° 927 1849202
3
- II
C. Permit Fees
1. A permit fee of $75.00, or as authorized by Colorado
State Statutes or Weld County Charter, shall be required
of applicants for new individual sewage disposal systems,
payable at the time of application to the Weld County Health
• Department. Permit fees are nonrefundable. Permit applications
are non-transferrable. The issuance of a permit does not denote
approval of any zoning requirements.
2. A permit fee of $25.00 shall be charged for the alteration or
repair of an existing individual sewage disposal system, except
where an entire absorption field is required. Such a new
area will require a complete site evaluation and payment of the
$75.00 permit fee. However, under conditions of alteration or
repair, the applicant must fill out the application for an
Individual Sewage Disposal System permit and a final inspection
of the completed repairs or alterations must be made by the
Health Officer with proper notice as specified in Section 3.9
by the applicant.
•
3. A permit fee of $25.00 shall be required of applicants for any
system that requires only a vault or holding tank with no leaching
area. An application for an Individual Sewage Disposal System
permit must be completed by the owner and a final inspection must
be made by the Health Officer upon proper notice by the owner or
system contractor, as specified in Section 3. 9.
4. Any addition to a structure which will or is likely to result
in expanded leachingof an existing system shall require approval
by the Department and may require expansion of the individual
sewage disposal system or parts thereof. No fee shall be
charged unless an entire new absorption area is required.
5. Owners of sewage disposal systems which are required by the
conditions of their permit to submit effluent samples to the
Department, shall pay a fee of $30.00 per sample and 20 per
mile traveled from the Department to the site and return for
each sample taken by an employee of the Department. Any owner
or occupant may request the collection and testing of an effluent
sample at the above fee which may be done at the option of the
= Department, or may have an approved engineering firm or laboratory
collect and test the samples and submit the results to the
Department.
3,4 Preliminary Investigation: After receiving an application for an
individual sewage disposal system permit, an Environmental Health
Specialist of the Division or a Registered Professional Engineer shall
visit the applicant's property to make a preliminary investigation on
behalf of the Department, consisting of:
•
00(927 . 1849202
to 3- 1
A. Inspection of the Premises.
B. verification of soil percolation or hydraulic conductivity
tests. The owner shall insure that the soil percolation holes
and the boring or excavation shall be staked and identified and
•
left open for inspection, although the holes may be covered by
boards or other temporary cover for safety reasons.
C. General geological conditions.
D. The determination of the suitability of the site and of the proposed
design based upon the land use and population density in the area,
the use to which the property is to be put; the size of the lot;
depth verification of the ground water table, suitable soil, and
depth to bedrock; the location of the disposal system with reference
to wells, streams, lakes, ditches, structures, and other geographical
features.
E. When specific evidence indicates that subsurface conditions exist
that may endanger the Waters of the State, additional hydrological,
geological, or engineering information provided by a Registered
Professional Engineer or Geologist, may be requested. This require-
ment shall not prejudice the right of the Department to develop
information from the Department's own sources.
F. When in the opinion of the Health Officer, or his designated agent,
the Department possesses sufficient information to make one or more
provisions of this section unnecessary, he may waive all or any
part thereof. If sufficient information is unavailable for the
evaluation of an application, the Health Officer or his designated
agent may require additional tests, including soil percolation
tests, of the owner.
3,5 After reviewing all required information, the Department may give condi-
tional approval for a permit for the proposed sewage disposal system, or
may recommend disapproval of the application and denial of the permit if
the proposed system cannot be made to comply with these regulations.
The conditional approval shall set forth conditions precedent to the
issuance of a permit including effluent testing, cleaning or maintenance
schedules, or other special conditions. No permit shall be issued to the
applicant, or to a subsequent owner, until the conditions have been met.
Except as provided in 25-10-107, CRS 1973, no permits shall be issued for
the following systems unless they are designed by a Registered Professional
Engineer and after they have been reviewed and approved by the Board of
Health.
-O-
•
1849202
5001( 927 e3 - i3
A. Systems disposing of effluent into State Waters
B. Systems disposing of effluent upon the ground.
C. Systems which service commercial, business, institutions,
industry or multi-family dwellings.
D. Absorption fields for which the location cannot meet suitable
soil or slope requirements.
E. Experimental systems.
3,6 In the case of any system with a design capacity over 2,000 gallons
of sewage per day, or which discharges effluent into State Waters, or
are designed to serve 20 or more persons per day, the Department may
give its conditional approval or may disapprove the State application.
Thereafter the conditionally approved application, together with the
Department recommendation, shall be forwarded to the Water Quality
Control Commission for its review. If either the Department or the
Water Quality Control Commission disapproves the application, no permit
for the installation of the system shall be issued. Such systems shall
be maintained and operated so as to meet the requirements of the permit
and these regulations.
3,7 If both a building permit and an individual sewage disposal permit are
issued for the same property and construction is not commenced prior to
the expiration date of the building permit, the individual sewage disposal
Permit shall expire at the same time as the building permit. If an
individual sewage disposal system permit is issued for property on which
no building permit is required, the individual sewage disposal permit shall
expire one year after its issuance if construction is not commenced. Any
change in plans or specifications after the permit has been issued invalidates
the permit unless approval is secured from the Health Officer, or his
designated agent, for such changes. Expired permits can only be renewed
by payment of the $75.00 permit fee and only if:
a. There has been no change in the plans and specifications of the
proposed system as set out in the original application; and
b. The surrounding land, its use or zoning, have not changed so as to
cause the original application not to be acceptable under these
regulations.
The property owner shall be responsible for the proper installation and
maintenance of an individual sewage disposal system and for the abatement
of any nuisance arising from ins malfunction or failure.
�oc4- 927 1849202
63 - iy
3,8 The issuance of a permit does not constitute assumption by the Department
or its employees of liability for the failure of any sewage disposal system,
nor act as a certification that the equipment used in the system, or any
component thereof, used in its operation insures continued compliance with
the provisions of Article 10 or Title 25, CRS 1973, the rules and regulations
adopted thereunder of any terms and conditions of a permit.
3.9 When construction of a sewage disposal system has been completed, the Systems
Contractor or owner shall notify the Department, and a representative of
the Department shall make a final inspection within 24 hours, or at a later
agreed time, after receipt of notice, Saturday-Sundays and holidays excepted.
If the final inspection is not made within the time provided for herein,
the Systems Contractor may proceed to cover or complete the installation.
3.10 If upon final inspection of the system, the Health Officer finds it
installed in accordance with these regulations and the Permit, the Health
Officer shall issue final approval for the completed system. If the system"
has been designed by or constructed under the supervision of a Registered
Professional Engineer, the Department shall require that said engineer shall
at this time certify to the Department that construction and installation of
the system has been completed in accordance with the terms of the permit and
this regulation. If the inspection discloses any significant departure
from the description or design of the system as stated in the application
and permit, or if any aspect of the system fails to comply with this regula-
tion, approval shall be withheld. Written notice of deficiencies causing
the disapproval shall be given the Systems Contractor. Another inspection
shall be made upon notification from the Systems Contractor that the
deficiencies have been corrected and the system brought into compliance
with this regulation.
3.11 Denial of a permit or disapproval of plans:
A. Notice of denial: Written notice of the denial of a permit or disapproval
of plans shall be served upon the applicant as provided by the Colorado
Rules of Civil Procedure or by registered or certified mail, return
receipt requested. Service by mail shall be complete upon receipt by
the Department of the return receipt.
B. Appeal to the Board of Health: Any person who is denied a permit or
whose plans for an individual sewage system are disapproved may appeal
to the Board of Health as herein provided.
C. Variance on appeal: Upon finding that strict enforcement of these
regulations would cause undue hardship to the applicant and a further
finding that a variance would not be injurious to public health, the
Board of Health may authorize the issuance of a variance. The burden
of proof is upon the applicant to show the variance will not injure
adjacent properties, will not conflict with the purposes of these
regulations and will not adversely affect the health of any person.
-11-
b007 1849202
lc 3 - /O-
D. Should the Board of Health deny an appeal under Section 3.11 C.
hereof, the applicant shall have the right to appeal such decision
to the Weld County Board of County Commissioners pursuant to Sec-
tion 3-8(4) (n) of the Weld County Home Rule Charter.
E. Time of Appeal: every appeal must be filed within thirty (30) days
from the date of denial.
F. Finality of Denial: denial shall become final upon the expiration
of time for filing an appeal or when final action is taken upon an
appeal, whichever is later.
3,12 Community Sewers
Permits to construct, extend or replace an individual sewage disposal system
shall be denied if a community sewer is within 400 feet of the applicant 's
dwelling, place of business, or institution; and if the municipality or dis-
trict agrees to provide sewer service.
3,13 Acceptable Design List
The Health Officer shall prepare a list of approved septic tanks, aeration
plants, evapotranspiration systems, or other systems and equipment, which
will receive permits for installation provided site requirements are met.
Manufacturers or designers may request approval of standardized equipment or
systems. Approval shall be granted only after submission of such information
as maybe requested by the Department. Designs that meet all of the require-
ments of this regulation will be included on the list. The list shall be
revised periodically and shall be available to any person upon request. Any
design may be reviewed by the Health Officer at any time upon reasonable notice
to determine if it complies with this regulation. Experimental designs, pro- _
perly identified as such, which are undergoing testing, may be included on the
list with appropriate comments by the Health Officer.
3.14 Except for designs or types of systems which have been approved by the Colo-
rado Department of Health, the Board of Health may approve an application
for an experimental type system, not otherwise provided for in these regula-
tions, only if the system has been designed by a Registered Professional
Engineer, and only if the application provides for the timely installation
of a back-up system of an approved type in the event of failure of the experi-
mental system. The Board of Health shall not arbitrarily deny any person the
right to consideration of an application for such a system and shall apply
reasonable performance standards in determining whether to approve such an
application.
3,15 Submission of Plans for Proposed Subdivisions
Plans for proposed subdivisions shall be submitted to this Department for the
review of proposed sewage disposal systems by an Environmental Health Spe-
cialist or a Registered Professional Engineer in accordance with require-
ments of this regulation and the requirements of the Weld County Planning
Commission. The Health Officer may require the subdivider to submit
additional engineering or geological reports or data and to conduct a study
-12-
800K 927 1849202
!n3 -i6
of the economic feasibility of the sewage treatment works prior to making
recommendation. No plans shall receive the approval of the Board of County
Commissioners unless the Department has made a favorable recommendation
regarding the proposed method of sewage disposal. Plans shall then be
forwarded to the Water Quality Control Commission for their review and
approval or disapproval. Appeal from an unfavorable recommendation here-
under shall be in accordance with the procedures set out in 3. 11.
3,16 Prohibition of individual sewage disposal systems in unsuitable areas.
The Board of Health may conduct a public hearing after written notice
to all affected property owners as shown in the records of the County
Assessor and Publication of Notice in a newspaper of general circulation,
at least ten (10) days prior to the hearing, to consider the prohibition
of permits for individual sewage disposal systems in defined areas which
contain or are subdivided for a density of more than two dwelling units
per acre. The Board of Health may order such prohibition upon a finding
that the construction and use of additional individual sewage disposal
• systems in the defined area will constitute a hazard to the public health.
In such a hearing, the Board of Health may request affected property owners
to submit engineering and geological reports concerning the defined area
and to provide a study of the economic feasibility of constructing a sewage
treatment works.
3,17 General Prohibitions:
A. No city or county shall issue to any person a permit to construct
or remodel a building or structure which is not serviced by a
sewage treatment works, until a permit for an individual sewage
disposal system has been issued by the Department.
B. No city or county occupancy permit shall be issued to any persons
for the use of a building which is not serviced by a sewage treat-
ment works until a final inspection of the individual sewage
disposal system has been made by the Health Officer, as provided
in 3. 10 and the installation has received the approval of the
Health Officer.
C. No individual sewage disposal system presently in use which does
not comply with the provisions of this regulation regarding .minimum
separation between the maximum seasonal level of the groundwater
table and the bottom of an absorption system, shall be permitted
to remain in use without compliance with this regulation.
D. Construction of cesspools is prohibited.
E. No more than one dwelling, commercial business, institutional or
industrial unit shall be connected to the same individual sewage
disposal system unless such multiple connection was specified in
the application submitted and in the permit issued for the system.
Y. No person shall construct or maintain any dwelling or other occupied
structure which is not equipped with adequate facilities for the
saritary disposal of sewage without endangering the public health.
Adequate facilities is defined as being within 200 feet and under
the same ownership.
_t u_
•
•
BOOK 927 1849202
b3 - / 7
G. No permits shall be issued for systems which permit the drainage
of effluent off the property of origin except as described in Section
VIII.
3,13 The Health Officer may issue a repair permit and an emergency use permit
to the owner or occupant of property on which a system is malfunctioning-
-Application for a repair permit shall be made by such owner or occupant
to the Department within two business days after receiving notice from
the Health Officer that the system is malfunctioning or otherwise consti-
tutes a nuisance of hazard to public health. The permit shall provide
for a reasonable period of time within which repairs shall be made at the
end of which period the system shall be inspected by the Health Officer
to insure that it is functioning properly. .Concurrently with the issuance
of a repair permit, the Health Officer may issue an emergency use permit
authorizing continued use of a malfunctioning system on an emergency
basis for a period not to exceed the period stated in the repair permit.
Such an emergency use permit may be extended for good cause shown in the
event repairs may not be completed in the period stated in the repair permit
through no fault of the owner or occupant. It is the intent of the
Weld County Board of Health that all systems installed shall meet the
requirements of these regulations, except, that in instances where strict
enforcement of these requirements would create an undue hardship, a request
for a variance may be made to the Department in accordance with 3.11
for repair or upgrading of existing systems where the size of the lot
precludes adherence to the distance requirements in Table II, the repaired
facility shall not be closer to water supply components than the existing
system.
3,19 Notice of Violations: Whenever the Health Officer determines teat there
there has been a violation of any provision of this regulation, he shall
give notice of such violation to the responsible person or persons. Such
notice shall be in writing, and shall particularize the violations,
provide a resonable time for correction and be addressed to the owner of
the property concerned. Service of such notice shall be as provided
by the Colorado Rules of Civil Procedure or by registered or certified
mail, return receipt requested, deliverable to addressee only. Service
by mail shall be complete upon receipt by the Department of the return
receipt. If one or more persons cannot be found or served, after a diligent
effort to do so, service may be made by posting a notice in a conspicuous
place in or about the property affected by the notice, in which case the
Health Officer shall include in the record a statement as to why the
posting was necessary.
3.20 Cease and Desist Order: The Health Officer may issue an order to cease
and desist from the use of any system which is found by the Health Officer
to be malfunctioning or which otherwise constitutes a nuisance or hazard
to public health and which has not received the timely repairs in accordance
with the provisions of 3.19. Such an order may be issued only after a
hearing which shall be conducted by the Health Officer not less than 48
hours after written notice thereof is given to the owner of the property
or. which the system is located and at which the owner may be present with
counsel and be heard. The order shall require that the owner bring the
system i ;to compliance or eliminate the nuisance or hazard within a reasonable
period of tine, not to exceed thirty (30) days, or thereafter cease and
desist from the use of the system.
-14-
B�x 92'7 1849202
b3 - i8
3,21 Regulations of Systems Contractors
A. Systems Contractor Licensing Requirements
1. No person except as in (2) below, shall install, engage
• in the installation of, or repair an individual sewage
disposal system unless he holds a valid Systems Contractor
License. Employees of a validly licensed Systems Contractor
shall not be required to be licensed. The initial fee for
a Systems Contractor License shall be $25.00. License shall
expire on December 31 of each year and shall be renewed within
30 days prior thereto, and an annual renewal fee of $10.00
shall be charged. A license which lapses shall be subject to
the fee established for new licenses upon reapplication.
2. Any landowner of record may install an individual sewage
disposal system for his own private use, not to exceed one (1) per
year, without obtaining a Systems Contractor License. Said
landowner's installation shall be subject to inspection by the
Department as herein provided and otherwise completed in
accordance with these regulations.
B. Standard of performance required of holders of Systems Contractor
Licenses
1. Application for Systems Contractors Licenses or renewals shall
be made upon forms supplied by the Department.
2. Prior to the issuance or renewal of a license the Health Officer
may require the applicant to demonstrate adequate knowledge
of these regulations.
3. Installation, renovation or repair of any individual sewage disposal
system shall be in compliance with these regulations and with the
conditions set out in the installation permit.
4. Notice of a requested inspection shall be given by the license
holder not less ,than 24 hours before the inspection is to be made.
5. A licensed holder shall have in his possession a copy of the
installation permit at the time of final inspection so that final
approval may be endorsed upon it.
C. Revocation of a Systems Contractor License
1. A license may be revoked for failure to comply with these regulations
or for other good cause shown. Revocation shall take place only after
a hearing before the Board of Health. The license holder shall be
given not less than 10 days notice of the hearing and may he repre-
sented at the hearing by counsel.
_15_
1849202
e cw' 92'7 b3- /9
C. Revocation of a Systems Contractor License (continued)
2. Written notice of revocation, particularizing the violations
shall be served upon the holder of the Systems Contractor
License. Service of notice as required in this Section shall
be as provided by the Colorado Rules of Civil Procedure, or by
registered or certified mail, return receipt requested, deliverable
to addressee only.
D. The Board of Health shall, from time to time, set qualification
standards for licensed Systems Contractors.
3.22 Regulations of Systems Cleaners
A. No person shall engage in the cleaning of sewage disposal systems or
the transportation of sewage to a disposal site unless he holds a
valid Systems Cleaner License. Employees of a validly licensed Systems
Cleaner shall not be required to be licensed. The initial fee for a
Systems Cleaner License shall be $25.00 per year. Licenses shall
expire on December 31 of each year and an annual renewal fee of $10.00
shall be charged. A license which lapses because of failure to renew
or is revoked shall be subject to the fee established for new license
upon reapplication.
B. Standard of Performance for Systems Cleaners
1. A license holder, when cleaning a septic tank or aeration plant,
shall remove the liquid, sludge and scum, leaving no more than 3
inches depth of sewage in a non-backflowing septic tank or aeration
plant. In backflowing types of systems cleaning shall be effective
in reducing solids and scum to the point of a near new system.
2. A license holder shall maintain his equipment so as to insure that
no spillage of sewage will occur during transportation, and that
his employees are not subjected to undue health hazards.
3. A license holder shall dispose of the collected sewage only at a
site designated by the Weld County Board of Commissioners and by
the Board of Health.
4. Prior to the issuance of or renewal of a license, the Health Officer
may require the applicant todemonstrate adequate knowledge of
3. 17 A,B,C.
C. Revocation of A Systems Cleaner License
I. The procedures as described in 3. 21 (C) shall be followed for the
revocation of a license.
•
13001(92'7 1849202
b3 - ao
3.23 Maintenance, cleaning, and effluent testing schedules.
A. In order to insure good working order the following minimum schedule
is recommended for all individual sewage disposal systems:
TYPE OF TREATMENT INSPECTION/ CLEANED/ ROUTINE EFFLUENT
MAINTENANCE PUMPED TESTING
•
Septic Tank Every year Every 4 yrs. Experimental only
Vault, Privies Every 4 yrs. As necessary None
Aeration Plant Every 6 mos. Every 4 yrs. Not more than 2 times/year.
B. The owner shall be responsible for the required maintenance and
cleaning of his system. Samples may be taken at anytime when necessary
to implement 3. 19 or 3. 20 of these regulations.
C. In addition to testing results conducted by the Department itself, the
Department shal accept, in lieu thereof, results conducted by the
Colorado Department of Health and results conducted by a certified
laboratory of the owner's choice.
D. Tests may be limited to those parameters which are necessary to
determine the maintenance of the required standards for the disposal
method.
E. The owner of a vault shall maintain all pumping receipts for at least
5 years and shall make such receipts as are in the owner' s possession
available to the Department for review upon written request of the
Department.
3.24 Penalties
A. Any person who commits any of the following acts or violates any of
the provisions of the regulation commits a Class I petty offense,
as defined in Section 18-1-107 CRS 1973.
B. Constructs, alters, installs, or permits the use of any individual
sewage disposal system without first having applied for and received
•
a permit as provided for in 25-10-106 CRS 1973 or 25-10-105 (2.g)
CRS 1973.
C. Constructs, alters or installs an individual sewage disposal system in
a manner which involves a knowing and material variation from the terms
or specifications contained in the application or permit.
D. Violates the terms of Cease and Desist Order which has become final
under the terms of 3. 2 of this regulation or the terms of 25-10-106 (2- (1)
CRS 1973.
-17-
BooK 927 1849202
63- a /
E. Conducts a business as a Systems Contractor without having obtained
the license provided for in 3.21 of these regulations or provided in
25-10-108(2) , CRS 1973.
F. Conducts a business as Systems Cleaner without having obtained the
license provided for in 3.22 of these regulations or provided for
in 25-10-108(2) , CRS 1973.
G. Willfully fails to submit proof of proper maintenance and cleaning
of a system as required by rules and regulations adopted pursuant
to 3.5, 3.22 or 3.23 or provided for in 25-10-106, CRS 1973.
3,25 Jurisdiction
These rules and regulations are promulgated by the Weld County Board of
Health under the authority of 25-10-104(2) , CRS 1973 and by the Weld
County Board of County Commissioners under the authority of the Weld
County Home Rule Charter, Section 3-8.
3.26 Severability
If any regulation adopted hereunder or its application to any person or
circumstance is held invalid, unconstitutional, void or inoperative, such
holding shall not affect other provisions or applications of the regula-
tions adopted hereunder. The Board of Health and the Board of County Com-
missioners hereby declare that in this regard, the regulations adopted
hereunder are severable, and that said Boards would have adopted the
remaining regulations hereof notwithstanding such holding.
3,27 Saving Clause
The repeal of any regulation adopted hereunder shall not deny any right,
action, or cause of action, which arose under existing regulations.
3,28 Effective Date:
These regulations shall become effective upon the date of adoption,
/(!",4/ with the concurrent repeal of existing Rules
and Regulafioris (adopted January 1, 1974, amended and revised on
May 27, 1976) .
-18-
K
g°° 92,7 1849202
e3- as
SECTION IV: GENERAL TECHNICAL REQUIREMENTS'
4.1 Calculation of Sewage Flow
Where values can be obtained by measurement of flow and strength of
waste from existing facilities, those values shall be used. For new
facilities, Table I may be used as an average flow guide. Maximum flow
shall be considered as 150 percent of average flow and shall be the
basis for design purposes unless otherwise established by evidence
satisfactory to the Health Officer. For calculating the flow for
multiple family dwellings and mobile homes, use a figure of 3. 5 people
per dwelling unit or at least 2 persons per bedroom. In no event may
the system be designed so that the anticipated maximum daily sewage flow
exceeds the capacity for which the system was designed.
TABLE I
GALLONS/PERSON/DAY LBS. 5 DAYS
TYPE OF ESTABLISHMENT *GALLONS/UNIT/DAY B0D/PERSON/DAY
*BOD/UNIi/DAY
Residential
Hotels & Motels Without Private Baths 50 . 15
Hotels & Motels With Private Baths 60 .15
Multiple Family Dwellings or Apartments 75 .20
Rooming Houses 50 . 15
Single Family Dwelling 75 . 20
Commercial
Airline catering per meal served 3 .03
Airports (per passenger) ,not incL food 5 . 02
Airports (per employee) 10 .06
Bus service areas, not incl. food 5 .02
Country Clubs, not incl. food 30 .02
Day workers at offices 15 .06
Drivein theatres, not incl. food
(per space per day) 10 .06
Factories & Plants (exclusive of ind. wastes) 35 . 08
Laundries, self-service (gal./washer) 400 2.00
Movie Theatres, not incl. food
(per audience seat) 5 . 03
Restaurants (toilet, kitchen wastes/patron) 10 .06
(additional for bars, cocktail lounges) 2 .02
Restaurants (kitchen waste/meal served) 3 .03
Restaurants (with paper service/meal served) 1. 5 .C1
Stores (per public toilet) 400 2. 00
Work/Construction Camps (semi-permanent)
\with flus`. toilets)) 50 . 17
Work/Construction Camps (semi-permanent)
(without flush toilets) 35 . 02
Travel trlr parks/ind. water&sewage hook-up *100 *. 50
Travel trlr parks/without Ind. water/sewage * 50 *. 17
hookups
-10-
soO('927 1849202
• INSTITUTIONAL 63 -oZ3
Hospitals (per bed space) 250 . 20
Institutions other than hospitals (per bed
space) 125 .17
Mobile home- parks , independent 75 . 20
Schools , Boarding 100 .17
Schools , day (without cafeterias ,
•
gym, and shower) 15 . 04
•
Schools, day (with cafeterias, but not
gym or showers) 20 .08
Schools , day (with cafeterias, gym, and
shower) 25 . 10
Recreational & Seasonal
Camps, day (no meals served) 15 . 12
Camps, luxury resort 125 . 17
•
Camps , resort (night & day) with limited
plumbing •
p50 .12
Camps, tourist, trailer or campground *100 *.50
Cottages and small dwellings (seasonal
occupancy) 50 . 17
Parks, picnic (toilet wastes only) 5 . 06
Swimming pools and bathhouses 10 . 06
Country Club • — GAL/FIXTURE/DAY LBS/FIXTURE/DAY
Shower 500 •
. 48
Bath 300 29
Lavatory 100 . 25
Toilet 150 . 18
Urinal 100 .06
Sink 50
•
. 51
Public Park (During hours when park is open. )
Flush Toilet 36 . 04
Urinal 10 . 01
Shower 100 . 10
Faucet 15 . 04
Separate Flow — Residential Use
Bath/Shower 14 . 7 . 014
Dishwasher 1. 8 . 002
Kitchen Sink 4 . 4 . 045
Additional for garbage grinder 1. 4 . 052
Laundry washer 19. 5 . 037
Lavatory 8. 4 . 021
Water closet 24. 8 8 . 029
*Gallons per day - BOD 5 per day given on a per unit basis
.{,2 1 inim.= distances e e
c tit c:' Cca. ei.rs c-: n . ,. i,e : -nn .
pertinc:u „_ ..und features snail be es nre .c . , .,cc . . L__ II. .
-20-
TABLE II
Table of Minimum Horizontal Distances in Feet Between S
Components of a Sewage Disposal System and Pertinent
Ground Features i ]���
m m m to b j m O r u, r Cu r 'd '•C n 1 C 'd CO > Cu N
G: M F� N H O H Y. O P. `< H- 7 S rD r. 7 H rt Cr a
Fes. M CU 'O V. 7 0 7 7 W 7 r N 1 r F-+ r. M W 0
N F-, 7 n < a r N a s n r0 t+. I n n r. < - O
a c n P. `< P. Ca. a m a 7 O N 7 H c
F+. N N n 7 -,1
7 7 C a m a• to 01 a H. O a a. - d o Or
ao n O H d a < F-' c to < n r• to 7 E-'
H N c v n m o a rr 7 N F-' a o C
to r 7 in N t O N CO 'd H H. O c r. 0 -
N r• cn F' n n O H c cr O 7 7 co o n '+1 n
C 7 N N Co rt H H. rt 'd c O w H. 'r1
a r0 V - O S - Fn r-• a V n zi r- c H H r
H N n H V. W D: P. 0 H f0 0 F-• H n n f0
H. H r 7 n N 7 n y n .n (0 N F-6
n 1 < Fes. N N N y V. 10 £ DF 7 H O.
f0 w N 'O H V N 'O H. n n -
H D' C a H. H. Fi r fD cn rt fo O. H .
w
n k- n H O H F-+ '1 F-.' S H (/)
7 M rt H. Cu 7 N `< O to N m
o X' M O rt rt Fa- 7 f
7 7 r
n O O O n n o. 7 0
7 7 7 7 00
co ry
co
Spri.ngs, Wells or Suction Lines 50 50 50 60 60 100 100 100 100
Potable Water Supply Line 10 10 10 10 10 25 25 25 50
Cistern 25 25 25 25 25 25 25 25 25
MRaclling or Occupied Building 0 5a 15 15 I 15 15 15 20 20
roperty Lines 0 10b 10 10 10 10 10 10 25
Subsoil Drains 10c lOc 10 10 10 25 25 25 25
Lakes and Ponds 50c 50c 25 25f 25f I 25 25 100 100
Intermittent Streams(d) , Streams
-hr Water Courses,Irrigation Ditch .
I (f1 (z) 50c 50c 25 100f 100f 100 100 100 100
F—
Hale or Gully (e) lOc 10c 10 10 10 15 15 25 25
Note: The minimum distances shown above shall be main- d. Waterway or stream is defined as a feature which drains
tattled between the system components and the ground a watershed greater than one square mile.
`eotures described. Where geological or other conditions
• warrant, greater distances may be required. e. Swale or Gully is a narrow ravine or shallow depression
which carries water after a period of precipitation to
a. Components which are not watertight should not extend include snow runoff and has limited water sources and a ial
into anticipated root system or nearby trees. Distance drainage basin of one square mile or less. e- R
shown shall not apply to treatment plant. (
_ f. The Department may allow a lesser distance for fully N N
b. Distance shown shall not apply where effluent discharge lined systems in instances where the flood zone is not a Q, O
i.; not required to be contained on the premises of origin. factor for consideration. -,C, N
c. Crossings may be permitted where pipelines are con- g. The Department may allow lesser distances which meet
structed of sufficient strength to contain flows under State guidelines where irrigation ditch laterals not serv-
pressure.
ing as public water sources and where such lesser. distances
would not cause pollution or be detrimental to the septic
927 1849202
103 as
4,3 Performance of Soil Percolation Tests
A. Location
Soil percolation tests shall be performed in at least three (3)
test holes in the area in which the absorption system is to be
located, spaced uniformly over the proposed site, except there
shall be no less than one (1) test hole in any twelve hundred
(1200) square foot area of the absorption system. If an appli-
cation is for a system which does not utilize a soil absorption
system, but which employs a dispersal system, the Health Officer
may waive the requirement of percolation tests upon request by
the applicant supported by an adequate subsoil and bedrock report
and by a showing that the tests are not essential to the proper
design of the system and that the absence of test data involves
no danger to the public health.
B. Dimensions
1. The percolation test holes shall be from four (4) to twelve"
(12) inches in width or diameter, and shall be terminated at
the depth of the proposed absorption system or to a depth
of at least 30 inches. All test holes shall be flagged.
2. One soil profile test hole at least eight (8) feet deep or
to bedrock, .must be completed to give an indication of the
soil condition in the area including that soil zone at least •
four (4) feet below the bottom of the proposed absorption system.
C. Procedure
1. Percolation test holes shall be filled with water to a depth
of 14 inches or more at least 8 hours prior to but no greater
than 24 hours prior to making the water percolation test,
and shall be refilled with water if necessary to a depth of
at least 14 inches prior to final measurement.
2. From a fixed reference point, measure the time for the water
to drop one inch within the lower twenty-five percent depth
of the percolation test hole. The percolation rate shall be
reported in minutes of time per inch drop.
D. Calculation
The field percolation rate shall be the average rate of the perco-
lation tests after rate has stabilized in all the test holes observed
in the proposed absorption arcr:. A rate faster than five minutes per
inch or z rate slower than 60 minutes per inch shall render the location
unsuitable for an absorption system. However with percolation rates
faster than five minutes per inch in sandy soils, systems may be permitted.
The field percolation rate shay_ be used in calculating the absorption area
required for the proposed system.
Bo"' 927 1849202
63 - a4
Sites with unsuitable percolation rates shall necessitate additional
soil evaluation and design by a Registered Professional Engineer
if an absorption system is to be proposed. In no event shall the
calculated absorption area be less than that area required for systems
with percolation rate of five minutes per inch.
E. Performance of Percolation Tests
1. The percolation test shall be performed by or under the
supervision of a registered professional engineer or by a
competent technician of the local health department unless
the tests were previously performed by a registered professional
engineer and the results thereof submitted with the application
for the permit.
2. If the applicant demonstrates to the satisfaction of the Health
Officer that the system is not dependent upon soil absorption,
the requirement for percolation tests may be waived.
4,4 Alternative soil tests in lieu of percolation tests. •
Alternative tests may be approved by the Health Officer when adequate and
sufficient scientific evidence shows that such a test will provide proper
data from which reliable designs may be derived.
4,5 The location of the maximum seasonal gioindwater table shall be determined
by the following methods.
A. Direct visual observation of infiltrated water at maximum seasonal
elevation of the year within an eight foot boring or trench, or a
monitoring bore or trench observed throughout one year.
B. Observation of soil in a trench of at least eight foot depth for
evidence of crystals or salts left by the groundwater table; or
chemically reduced iron in the soil reflected by a dull grey or
mottled coloring.
C. Soil moisture tests indicating water saturation.
D. Determination of the piesiometric surface by the hydraulic gradient.
E. By other scientific methods approved by the Board of Health.
4.6 A suitable soil shall meet the following criteria:
A. Is at least four feet in depth to the maximum seasonal groundwater
table and to bedrock.
F. Has the capacity to adequately disperse the designed effluent loading
as determined by a field percolation rate of between 5 minutes per inch
and CO minutes per inch or by ether approved soil tests.
BOOK 92'7 1849202
63 - a7
C. Does not exhibit inhibition swelling characteristics.
D. Does not visibly enhibit a jointed or factured pattern of an
underlying bedrock.
E. Is not consolidated.
F. Acts as an effective filter within its depth for the removal
of pathogenic organisms.
-4,7 Disinfection of effluent (when required)
A. Disinfection shall be introduced into the effluent by an
automatic proportioning device.
B. A contact basin shall be provided for disinfection of effluent
which meets the following requirements:
1. A minimum of 60 minutes detention time.
2. A free residual chlorine (or equivalent) of 1.0 ppm
tested at the exit of the effluent pipe of the basin.
3. Thorough mechanical mixing or a basin having a lenoth to
width ratio of 40:1 with a sharp crested wire spanning the
entire width of the basin outlet. Other designs shall be
approved when proof of their effectiveness is submitted
for an acceptable design.
•
B°°'J27 1849202
( 3 - a8
SECTION V: REQUIREMENTS FOR SEPTIC SYSTEMS
5,1 Construction of Septic Tanks
A. Materials
1. Concrete septic tanks shall be made with Type II Portland Cement,
ASTM C-150, a sulfate resistent cement. All concrete used in making
septic tanks shall have a minimum of 51 sacks of cement per cubic yd.
of concrete and shall achieve approximately 3,000 p.s.i. in strength
at the end of 28 days. Welded wire mesh(6x6 10/10) which is 10 gauge
wire spaced at 6 inches on center each way shall be used as a mini-
mum in all walls and floors. Wire used in the floors shall be tied
or spliced to the wire used in the walls. Wall and floor thickness
of all precast concrete septic tanks shall be per the form used (if
manufactured commercially) but in no case shall they be less than
4 inches if the septic tank is formed and poured on the job site.
The septic tank lid or cover shall be a minimum of 4 inches thick
with 1 access hole above both the inlet and outlet and with the
access over the inlet to be not less than 20 inches in diameter.
Access hole diameters of not less than 12 inches may be used upon
approval of the Health Officer. Reinforcing in the septic tank lid
shall be such that the lid will support at least 3000 pounds placed
at the center of the lid. The precast concrete manufacturer's name
and size of the tank shall be cast into and/or painted on the septic
tank lid at its center.
The tank compartment divider shall he constructed of the concrete
specified above and shall be no less than 2 inches in thickness.
2. Metal or coated metal tanks are prohibited. Other materials, such
as fiberglass, which may result in an adequate and durable construc-
tion and that resist excessive corrosion must first be certified by
a Registered Professional Engineer and then approved for use by the
Board of Health.
B. Septic Tank Design
1. All tanks shall have a minimum of 2 compartments or units in series.
2. The outlet invert shall be at least 3 inches below the inlet invert.
A baffle and/or tee shall be provided to divert the incoming sewage
downward. The baffle and/or tee shall penetrate at least 6 inches
below the liquid level, but not more than 17 inches. The outlet shall
be fitted with a tee and/or baffle and the outlet device shall extend
a minimum of 14 inches below the invert of the outlet. The outlet shall
be conspicuously marked as such on the tank exterior next to the outlet
hole. A minimum 4 inch diameter to a maximum 6 inch diameter sweep
elbow pipe or aperature shall be located at least 14 inches below the
outlet invert in the partition of a two-compartment tank but not in
the sludge zone. If a sweep elbow pipe is used, it shall be located
in the first compartment and shall be plastic pipe.
-25-
B°(" 92. 7 1849202
63 - a4
3. Proportions:
a. The tank shall have a liquid depth between thirty (30) inches
and sixty (60) inches.
b. The distance from the outlet invert to the underside of the
tank top shall be at least ten (10) inches.
c. The tank may have various shapes provided the capacity, inlet,
outlet, and depth requirements are met, and it has a uniform
horizontal flow thoughout its length.
4. Tank shall be waterproof.
5. The first compartment of a two-compartment tank shall hold one-half
to two-thirds of the effective capacity of the tank.
6. Plans and specifications must be submitted and approved by the
Health Officer for all tanks fabricated on the site.
5,2 INSTALLATION OF SEPTIC TANKS:
A. Tanks are to be installed on a solid base and shall be level. The
tank shall be installed with removeable covers or manholes extended
to within twelve (12) inches of finished grade in order to provide
access to the inlet and outlet devices of each compartment for
cleaning and inspection. Roof drains, foundation drains, area
drains, or cistern overflows are not to enter the tank or any part
of the treatment system.
B. The building sewer to septic tank shall be laid with a minimum fall
of 1/8 inch per foot (1/4 inch fall per foot is recommended) . Bends
in the building sewer shall be limited to 45 degree ells, or long-
sweep quarter bend. Cast-iron pipe or a- minimum of Schedule 35 PVC
pipe is required whenever the building sewer is located under a
driveway. The building sewer installation shall meet all of the
requirements of the Colorado Technical Plumbing Code, 1972 Revised
or such local Code as may be in force. The inlet and outlet pipes
shall be grouted and sealed with waterproof materials.
C. Backfilling around a septic tank shall be accomplished in a manner
to prevent settlement and avoid undue strain on the tank and the
pipes entering and leaving the tank. Cast-iron pipe or a minimum of
Schedule 35 PVC shall be used for the building sewer and from the
septic tank to the head of the leachfield and shall be laid with a
minimum fall of 1/8 inch per foot.
D. All septic tanks and vaults shall be located and maintained 1:.
an area which is accessible for tha cum;ir,g of weir conten_s.
Abandoned septic tanks, ces cals, c aga pits, and v. nlLs sisal be
puripe-d of septic material the:: filled with soil, or they shall be
removed.
-26-
BOOK 927
1849202
63 - 30
5.3 MINIMUM CAPACITIES FOR SEPTIC TANKS:
A. For a one or two family dwelling, the minimum capacity shall be
determined by the number of bedrooms (at two people per bedroom)
being served according to Table III:
TABLE III
Number of Bedrooms Minimum tank capacity (gal)
3 or less 1000
4 1250
each additional add 250
B. For a three or more family dwelling, industrial, commercial, or
institution, the minimum capacity shall permit retention of incoming
sewage for thirty (30) hours at 150% of the estimated daily average
flow, but in no case shall be less than 1000 gallons capacity.
5,4 GENERAL REQUIREMENTS FOR DISPOSAL OF EFFLUENT INTO AN ABSORPTION FIELD AREA:
A. The methods for calculating minimum absorption area shall be based
upon the capacity of the soil to absorb liquids as established
by the percolation test or other approved soil tests.
B. Unless designed by a Registered Professional Engineer and approved
by the Board of Health, no absorption system shall be permitted where:
1. Sufficient suitable soil is not available.
2. Where the ground slope is in excess of 30 percent in the area
of the proposed absorption system.
C. Absorption Area:
1. Table IV shall be used for determination of the minimum absorption
area required per bedroom for a one or two family dwelling.
In other type uses, the minimum absorption trench area in square
feet (A) shall be determined as a function of the estimated
quantity of sewage flow in gallons per day (Q) and the percolation
rate in minutes per inch (T) , according to the formula:_,
A. 2.?
S
Note: Where the percolation rate is found to be faster than
five (5) minutes per inch in sandy soils the value for "T"
for use in this formula shall be five.
2. Seepage bed absorption area minimums shall be calculated at
1. 3 times the calculated absorption area required for absorption
trenches.
-27-
BOOK 929 1849202
163 - 3(
TABLE IV SUBSURFACE ABSORPTION AREA FOR D4ELLING USE
Percolation Rate Trench Absorption Area Bed Absorption Area
Min/Inch Per bedroom in Sq. Ft. Per bedroom in Sq. Ft.
5.0 125
165
7.5 145
190
10.0 165 215
1.2.5 183 237
15.0 200 260
17. 5 209 271
20.0 217 - 282
22.5 225 293
25.0 234 303
27.5 243
30.0 325
250 325
32.5 258 340
35.0 267 348 _
37.5 275 357
40.0 284 368
42.5 293 377
45.0 300 388
47.5 308 397
50.0 316 410
52. 5 325
422
55.0
333 435
57. 5 342 447
60.0 350
460
-28-
e°tn-•
27
1819202
63- 3 z,
3. Where absorption systems arc to be installed in new fill material,
the fill must be designed or tested by a Registered Professional
Engineer. In addition, the fill material shall consist of well-
graded soil with a percolation rate between 10 and 30 minutes per
inch, free of heavy sod or other organic material, trash, frozen
material or debris. Backfill shall be deposited in layers not
• exceeding 6 inches in thickness, and each layer shall be compacted
by means of mechanical tampers, pneumatic rollers or other similar
means. The degree of compaction and density for tilled areas shall
be 85 percent of maximum density at optimum moisture content.
Compaction tests shall be performed and the results thereof trans-
mitted to the Health Officer.
Distribution Box: If used it a system, the distribution box shall
be sufficient size to accommodate the necessary field lateral lines
and shall be constructed with the inlet invert at least one (1) to
six (6) inches above the floor of the distribution box. The distri-
bution box shall be watertight and all pipes shall be grouted or cemented.
The box shall be located a minimum of five (5) feet from the septic tank.
E. Dosing Tank: If used in a system, dosing tanks shall be watertight.
The size of the dose, or the net capacity of the dosing tank shall be
60 to 75 percent of the volume of the distributors dosed at one time,
unless a pressurized system is used.
F. Lift Station: If used, shall be constructed of either concrete or non-
metal materials. The non-clog pump opening shall have at least a two-inch
diameter solids handling capability where raw sewage is pumped or at least -
a three-quarter inch diameter solids handling capability if previously
settled effluent is pumped. Automatic liquid level controls shall be
provided to start and stop pumps at a frequency required by the design.
Pressure pumps shall be of sufficient strength to accommodate pump
discharge pressure and the pump shall be sized to maintain a velocity
of two or more feet per second. Automatic air release valves shall
be installed at high points in the pressure line where necessary to
prevent air locking. A storage basin preceding the pump shall be
provided to allow pump cycling commensurate with pump design capacity.
5.5 ABSORPTION TRENCHES
A. At least two trenches of near equal length shall be constructed with a
length not exceeding 100 feet; a width not exceeding 3 feet; and a depth
not exceeding 3 feet to the bottom of the excavated trench. Only one
trench will be required if the system required total area does not exceed
200 square feet. There shall be a minimum (horizontal measurement) of 6
feet of undisturbed earth between adjacent trenches. Any dimensional
change from these specifications require approval from the Health Officer.
A disposal line shall be provided for each trench and shall be surrounded
by clean, washed, graded gravel or rock or similar aggregate. The material
may range in size from one and half inch to two and half inches.
-29-
z'7
1.849202
63 -33
The material shall extend from at least two inches above the top of
the pipe, level across the trench, to at least six inches below the
bottom of the pipe. The top of the gravel shall be covered with
untreated building paper, a two inch layer of hay or straw, or a
similar pervious material to prevent the gravel from becoming clogged
by the earth backfill. An impervious covering shall not be used, as
this interferes with evapotranspiration at the surface. There shall be
at least 12 inches of backfill placed over the trench which shall be
graded to promote runoff water from the disposal area. No trees or
shrubs shall be placed closer than six feet to the trench. The bottom
of the trench shall be excavated level. Four foot depth of suitable
soil below the bottom of the trench is required. Machine tamping,
rolling or hydraulic compaction of final cover shall not be permitted,
however, hand tamping may be allowed where necessary to stabilize the
soil to prevent erosion or the intrusion of extraneous water.
B. A distribution device providing uniform distribution of effluent shall
be included. Perforated plastic distribution lines of three or four
inch diameter shall be fitted with tight joints and the perforations
shall be laid that an even distribution of effluent over the trench
system will occur. (Note: each perforated pipe segment shall be so
placed that effluent will be equally dispersed downward into the gravel
from each row of perforations per segment. ) The terminal ends of lines
shall be capped unless looped or air-vented.
5.6 JEEPAGE BFnS
A. Seepage beds shall be constructed with a length not exceeding 100 feet,
a width greater than 3 feet and a depth not exceeding 3 feet to the
bottom of the excavated trench. Any dimensional change from these
specifications requires approval from the Health Officer. A 12—inch
layer of 11 inch to 21 inch washed gravel, rock or other similar material
shall be distributed evenly and level over the entire bed, with
distribution lines set at a depth to insure at least six inches of
gravel below and two inches of gravel above each line. A cover of
untreated building paper, a two—inch layer of straw, or a similar
pervious material shall be placed on top of the gravel. After final
inspection, backfill shall be placed over the bed to minimum depth
of 12 inches. The final cover shall be graded to promote drainage
runoff away from the disposal area. In the case of an above ground
system, such as a mounded system, an impervious berm shall be constructed
to prevent lateral flow of waste discharge outside of the absorption
field. No trees or shrubs shall be placed closer than 6 feet from the
system. A 4-foot depth of suitable soil below the bottom of the bed
is required. Machine tamping, rolling or hydraulic compaction of
final cover shall not be permitted. However, hand tamping may be allowed
where necessary to stabilize the soil to prevent erosion or the intrusion
of extraneous water.
-30-
c:u , 927 1849202
63 -3L-)
•
B. The outer-most dispersal lines in the bed shall be placed no less
than 18 inches and no more than 36 inches from the outside bed walls.
For each 6 feet, or part thereof, in bed widths, there shall be one
disposal line extending the length of the bed. Such pipelines shall
be so spaced as to distribute the effluent evenly over the entire bed
area and shall meet the requirements of 5. 5B. A distribution box
or other distribution device providing uniform distribution of effluent
shall be included in the seepage bed system.
5.7 SEEPAGE PITS
A. Use: Seepage pits are permitted as an alternative only when absorption
fields are impractical, and where the top 4 feet of soil is underlain
with porous sand or fine gravel and the subsurface conditions are
otherwise suitable for pit installations. Where circumstances permit,
seepage permits may be either supplemental or alternative to the shallow
absorption fields. Seepage pits shall be permitted only if prior
approval has been obtained from the Health Officer.
B. Capacity: The capacity of the seepage pit shall be computed on the
basis of percolation tests made in each vertical stratum penetrated.
The weighted average of the results shall be computed to obtain a
design figure. Soil strata in which the percolation rates are in
excess of 30 minutes per inch shall not be included in computing the
absorption area. When seepage pits are used in combination with
absorption fields, the absorption area in each system shall be pro-rated "
or based upon the weighed average of the results of the percolation tests.
The effective area of the seepage pit is the vertical wall area (based
on outside diameter) of the pervious strata below the inlet. No allowance
shall be made for impervious strata or bottom area. The minimum absorption
area shall be equivalent to a two-bedroom dwelling using an absorption
trench.
C. Construction: The excavation for a seepage pit shall terminate at
least four feet above the groundwater table. The pit sidewalls and top
shall be made of concrete block, brick, perforated concrete rings, or
other suitable masonary material capable of equal structural integrity.
Mortar shall be used in the horizontal joints only. A removable cover
or manhole shall be provided. The annular space between the excavation
and the outside wall shall be filled with clean coarse gravel. The bottom
one foot of the pit shall be filled with clean coarse gravel. A tee
or ell shall be installed on the inlet pipe. Seepage pits shall be
separated by a distance equal to three times the diameter of the largest
pit. For pits over 20 feet in depth, the minimum space between pits shall
be 20 feet. Adequate safety protection shall be provided to protect
against injury during construction and use.
5.8 SAND FILTERS
A. Use: Sand Filters shall only he used if prior approval is obtained from
the Health Officer and if soil, slope or groundwater table conditions do
not allow for construction of a conventional absorption system. The top
-31-
.327 1849202
63 -35
of the sand bed shall be no less than 4 feet above the high ground-
water table for installationsin which effluent percolates downward
through the soil.
B. Construction:
1. Except when preceded by aerobic type sewage treatment plants
or other systems designed by a Registered Professional Engineer,
the filtering material shall be clean, coarse sand, all passing
a screen having four meshes to the inch. The sand shall have an
effective size between 0. 25 and 0.6 mm. The uniformity coefficient
shall be 4.0 or less. The sand shall be not less than 2 feet deep.
2. The distributors and underdrain, if required by the Health Officer,
or Registered Professional Engineer, shall be surrounded by coarse,
screened gravel or crushed stone. All of the gravel or stone shall
pass a 21 inch screen and shall be retained on a 3/4 inch screen.
Fine gravel, not more than 1/4 inch, may be used above and around
the coarse material, both at the distributor and at the underdrains.
3. The slope of the distributors shall be 0.5 percent where dosing
tanks are not used, and the slpe of the underdrains 0.5 to 1.0
percent. It is required that the sand be thoroughly settled by
flooding or other means before the distributors are placed at the
final grade. The distributor and underdrains may be of agricultural
tile, bell and spigot pipe, or perforated pipe.
C. Capacity
1. The minimum area for a sand filter shall be computed as a function
of the maximum daily sewage flow according to the following:
TYPE OF SERVICE Gallon/acre/day Gallon/sq. ft/day
Without garbage grinder 50,000 1.15
With garbage grinder 41,500 0.95
2. Dosing tanks shall be provided where the total filter area exceeds
1800 square feet and where the distributors shall be laid accurately
to grade after the filter sand has been thoroughly settled by flooding
or other means. Where dosing tanks are used, the distributors shall
be laid to 0. 3 percent grade; otherwise, they shall be laid to a
grade of 0. 5 percent.
5,9 SERIAL DISTRIBUTION SYSTEMS
A. Use: A serial distribution system may be used in all situations where a
soil absorption system is permitted and shall be used where the ground
slope does not allow for suitable installation of a single level absorption
field. The horizontal distance from the side of the absorption system
to the surface of the ground shall be adequate to prevent lateral flow and
eruption of effluent above ground.
-32-
1849202
ooOK • ' .
DIAA)
BoOK92,7 (03 - 36
B. Capacity: System capacity shall be ascertained using the same
procedures as outlined in 5. 4 C.
C. Construction: The bottom of each absorption trench and its dis-
tribution line shall be level. There shall be a minimum of 12 inches
of ground cover over the gravel fill in the absorption trenches. The
absorption trenches shall follow approximately the ground surface
contours so that variation in trench depth will be minimized. There
shall be a minimum of 6 feet of undistrubed earth between adjacent
trenches and between the septic tank and the nearest trench. Adjacent
trenches shall be connected with ari overflow line or a drop box arrange-
ment, in such a manner that each trench is completely filled with septic
tank effluent to the full depth of the gravel before effluent can
flow to the next trench downline. All other construction procedures
for the serial distribution system are outlined in 5.5 A and B.
1849202
92"r b 3 - 31
•
SECTION VI : REQUIREMENTS FOR EVAPOTRANSPIRATION SYSTEMS
6.1 Use
A. Evapotranspiration systems may be used where soil absorption
of effluent is not possible and where high water table, bedrock,
fractured rock, or highly pervious material precludes the use
of a soil absorption system.
B. An evapotranspiration system may be used exclusively or in
combination with a soil absorption system. Combination systems
are permitted where water table elevations or soil conditions
permit leaching, but percolation rates may not be satisfactory
or acceptable. Partial or no liners may be permitted. Calcu-
lations submitted for rates of effluent disposal shall include
the leaching rate, the percolation rate, and the evaporation rate.
5.2 Material and construction requirements
A. Septic tanks and aeration plants shall meet all of the requirements
as provided for in these regulations.
B. Liners shall be impervious to the chemical reaction and passage
of sewage. Polyvinyl chloride plastic lining, manufactured from
domestic polyvinyl chloride resin, of 10 millimeters thickness,
butyl rubber, or other nontoxic equivalent materials, shall be
used.
C. Matrix material shall be resistant to chemical decomposition and
the formation of colloidal particles. The matrix shall be well-
graded, and with the proper sizing to do the specified work of the
design. The content of fine particles shall be limited to the
extent that they do not inhibit capillary action or permeability.
6.3 Design requirements
A. All systems shall be designed by a Registered Professional Engineer
who shall furnish design calculations to support the design and size
of the system. Specifications to be furnished shall include, but
not be limited to: liner material and protection of liner, soil
analysis of select material, grain size, soil description, and pro-
vision for vegetation cover. The Board of Health shall review and
consider all evapotranspiration systems for approval.
B. Designs shall provide for adequate depth (at least 4 inches) of matrix
and biological or external heat sources to prevent freezing. Septic
systems shall provide at least 2-compartment tanks or 2 or more units in
series. Aeration plants shall be of sufficient capacity so that the
matrix will not become impermeable during malfunctions.
-34-
sac 929 1849202
• G3 - 38
C. The following formula may be used as a minimum guide for determining
the area necessary for total evapotranspiration of septic tank effluent:
Area (in square feet) = Flow (in gallons/day) x 586
Lake evaporation rate at the site
•
(in inches/year)
6.4 Installation
A. Septic tanks and aeration plants shall be level. The evapotranspira-
tion bed bottom and any capillary interface shall be level within
one inch as measured from any perimeter, and shall be cleaned or
smoothed of any sharp projections. A berm or drainage ditch shall
be provided for a control of surface water drainage. The bed shall
be located in an open area, where there will be exposure to sunshine.
B. The liner shall be sealed at all openings to the bed and shall com-
pletely underlay the matrix of the evapotranspiration bed. Seams
shall be bonded tightly and imperviously. Any damage to the ltner
shall be repaired using the proper solvent or mastic and patch of
the same material as the liner. Liners shall not be laid directly
on any sharp rocks or objects . A sufficient amount of sand or dirt
fill shall be added over sharp bedrock that will prevent the puncturing
of the liner. Workmanship shall be of sufficinet quality as to
maintain the integrity of the liner to its specifications. A liner
is required in high water table elevations, in jointed rock, or where
leaching is prohibited. If the problem is solely due to excessive
percolation rates, such rates may be retarded by soil building or
replacement soil requirements as listed in 5.4 (C.3) of these regu-
lations.
C. The matrix shall be installed with care so that the liner is not
perforated. Heavy machinery shall not be permitted to drive over
the matrix or the liner. The surface of the matrix shall be convex
so as to permit run-off of rainwater and to increase the air
turbulence over it. The surface of the matrix shall be provided
with sod, or with grass cover, or with any other plants specified
by the designer and shall be maintained as designed. The bed area
shall be protected as to prevent damage from vehicular or pedestrian
travel.
SECTION VII : REQUIREMENTS FOR ALTERNATE DISPOSAL SYSTEMS
7,1 Vaults
Shall have a minimum 1,000 gallon effective capacity and may be permitted
for indoor, water carriage sewage systems on property which cannot accommodate
a sewage treatment system. Vaults shall meet the same installation and con-
struction requirements as apply to septic tanks except that no effluent outlet
shall be provided. Vaults shall be provided with an indicator which signals
when pumping is necessary.
-35-
1849202
927 /3 -39
7.2 Vault Privy
shall be constructed to include - a concrete fly and watertight receptacle;
a superstructure affording complete privacy; an earth mound, around the
'top of the receptacle and below the floor level, which slopes downward
away from the receptacle; a floor and riser of concrete or other impervious
material; and a seat and lid of easily cleanable, impervious material,
hinged, .self-closing and fly proof. All venting shall be fly-proofed
with No. 16 or smaller mesh screening. The effective capacity of the
privy receptacle shall be no less than 400 gallons.
7,3 Chemical Toilets
Portable chemical toilets shall have a superstructure which meets the
requirements of a vault privy and shall have a sewage receptacle of
easily cleanable and impervious material which is accessible or removable
for thorough cleaning and disinfection. The use of portable chemical toilets
in permanently occupied buildings shall be prohibited except during con-
struction or under emergency circumstances with the approval of the Health
Officer. Non-portable chemical toilets shall be provided for permanent
installations and shall drain into a vault. Design and installation
shall meet the requirements of a vault, as outlined in 7. 1 and shall
meet the superstructure requirements of a vault privy, as outlined in 7. 2,
and shall meet all applicable Colorado Safety Codes.
7,4 Other Treatment Sysems
Other treatment systems which do not employ soil/sand absorption or
filtration. Those systems which discharge effluent directly to the
atmosphere, or to the ground surface, or below ground, or which employ
aerobic methods of sewage treatment, may be permitted only if they
are designed by a Registered Professional Engineer and with subsequent
review and approval by the Board of Health. Any such designed systems
must meet the requirements as listed in Appendix. This section shall
not apply to systems discharging below ground through a soil absorption
system or sand filter or to a non-discharging system.
7,5 Prohibitions
Cesspools, flush hopper toilets, mini-systems, incineration toilets,
composting toilets, wastewater ponds for primary treatment of human
sewage and any other systems not delineated in these regulations are
prohibited.
-36-
BOO 1849202
927 'a3 - .10
SECTION VIII : EFFLUENT DISCHARGED DIRECTLY TO WATERS OF THE STATE
Any system which will dispose of effluent by discharging into State
waters shall be designed by a registered professional engineer. The
application for such a system shall first be reviewed by the local
Board of Health. If the result of this review is favorable, the
application shall be forwarded to the Water Quality Control Commission
in accordance with the procedures prescribed by the Commission for
consideration of site location and issuance of a discharge permit.
Where the discharge is to be into an absorption system, it shall be
through suitable soil and, in such case, shall be considered as meeting
permit requirements for individual sewage disposal systems, unless
proven otherwise.
SECTION IX: NEW OR EXPERIMENTAL DESIGNS
9.1 The Board of Health acknowledges the need for progress in sewage treat-
ment and encourages the development of technology and design which will
further the development of sewage treatment and its efficient disposal.
Manufacturers whose designs lack sufficient background technical data
for inclusion on the acceptable design list may petition the Board of
Health for an experimental installation permit.
9.2 Requirements for an experimental installation permit:
A. That the design specification along with any previous laboratory
or field test shall be submitted for approval.
B. That the necessary field tests be agreed upon between the manu-
facturer and the Board of Health.
C. That the installation be made as stipulated.
D. That the field tests be made and that the results of these tests
be submitted to the Health Officer. All test costs shall be borne
by the manufacturer.
E. That the duration of the testing period shall be determined by the
Board of Health.
F. That the manufacturer or designer shall warrant the design and the
installation; and shall agree, in writing, to remove an unsatisfactory
installation, as determined by the Board of Health, within the time
limit stipulated by the Board. A back-up system of an approved type
shall be provided.
9.3 Upon satisfactory performance of the design and installation, the Board of
Health may approve the design for the acceptable design list.
-37-
1849202
6U'm 92 63 ti
9,4 An unsatisfactory installation may be repaired or changed in design with
the consent and observation by the Health Officer. However, the Board of
Health may limit the duration of the testing period, and may declare the
design and installation to be unsatisfactory and to be replaced by accept-
able installation or to be removed from the designated lot. Failure to
satisfactorily repair or remove an unsatisfactory installation shall be
deemed a violation of these regulations.
9,5 The application for an experimental system shall include provisions for the
timely installation of a back-up system in the event of failure of the experi-
mental system. The time allowed for replacement and the design of the
replacement system shall be approved by the Department prior to installa-
tion of the experimental system.
-38-
•
book 3 ‘1.2-
929
APPENDICES
Page
APPENDIX 1. Evaporation Map-Average annual lake evaporation 40
APPENDIX 2. Soil Classification System (Soil- Separate Size Limits) - 41
APPENDIX 3. Guide for Textural Classification 42
APPENDIX 4. Guide for Soil Compaction 43
APPENDIX 5. Requirements for Aerobic Sewage Treatment Systems 44
APPENDIX 6. NSF Standard 40 52
-39-
BOOK 92'7 1849202
U .S . Dept . of Co[merce b3 — vs
Weather 5ureau
Technical Paper No . 37
Evaporation Maps for the U . S .
Average Annual Lake Evaporation
1946-1955
b
•
• - U fat '. -( L.) • • a ". 1:51721L,:ii :
- - _. m ,ni -}_�;_:r
1
I I ->-
. 4 i rr., .5
\I I:, , ‘.1 il • l. -,\ % • 7.>, / _ ...--7__________-----E—
, i on , .
- \)\I C'1
)) ill
L '- A . �0
:,-DE r:5 1 ): 1
"c''` 92,7 1849202
. (c3 - 4/9
•
•
•
Soil Classification Systems
Soil-Separatic Size Limits
UNIFIED CAA UNDA AASHO ASTM
Colloids Colloids
oo°•_ Clay
Clay N
o•o,—----. — Clay Clay • r,
- Fines
' o
•°w" (Silt -- _ -
I o
s i
n
•°°,T. or Silt o
^
Clay) Sill Silt i
o°, - Fine Silt
on - ^
Very Fine I
Fine Sand 1
Fine Sand Fine
Fine Sand "' °
i . . Sand Fine Sand
C , , . Sand ..Medium I I` ne.
Sand , , ,
' • Medium Coarse Coarse o .o,,,
r „ Sand Coarse Coarse f,° ,,,���
Sand Sand __ Sand Sand
Very Coarse • •,
,° Sand
Coarse ,
- . band Fine ' �
,
Fine . •••••
Fine Gravel Gravel
♦•
_ .fl,
Gravel
Medium
,0• "+ ,i M
,°,.,-- -_ Gravel 9." 9•0•I
Coarse Coarse __ _
+_- Gravel Coarse Gravel .,,.,
„ . Gravel Gravel „•,
Gravel
Cobbles Cobbles .,
, „„„„.•• • Boulders
,00•
.00. .,• n°..,
•
'Included in clay fraction in test reports '
Source :
Virginia Erosion and Sediment Control Handbook .
APPENDIX 2
_qi_
. i : vi,5 Lm , 3 . .. i , -A ) LLiT IN
av2-.. THE BASIC SOIL-TEXTURAL CLASS` 1849202
b3 - y5
100
O
00
SAO. - •
. \-;7
•
70 VX
Cllr
rs
/ .
ti
` SEAsln0r
''CLAY
[LIr SIL IY CL AY o
30 • 101Y N LOAN
SANDY CLAY
LOAN /
e
e
\ LOAN
SAND1 LOAN Slll 14171 o
10 •
/SAND\ L5OLA1n0 • ♦\ \ 1Ny\\o
oo O O Co o 'o o •O o
•
PENCCUI SAND
u S 11110110 21112 1Y. 111S
(--1-1-1-1-1
IC 70 .010 -. 100
1 T1Tl f l.:ITTT71
S Alto
_ SILT CLAY
-7--I—A- i --L I ' i I—L L__J
;1521 5111 , ..
Source : EPA Design Manual for Land Treatment of Municipal Wastewater
APF'EGDIX 3
-42-
Guide For Soil Compaction • 1849202
sp°Y 92'7
The percent of relative compaction required will be equal •
to or greater than minimum values as shown in the follow
ing table for the various classes of soil and type of
compaction.
AASHTO AASHTO
Soil Classification 799 T180
(AASHTO M145) Minimum Minimum
Relative Relative
Compaction Compaction
(%) (%)
A-1 100 95
A-3 100 95
A- 2-4 100 95
A-2-5 100 95
All others 95 90
N0TES:
1 . AASHTO: American Association of State Highway Transportation
Officials.
2. AASHTO - 799: Standard Test Procedure - 5. 5 lb. Rammer
3. AASHTO - T180: Standard Test Procedure - 10 lb. Rancner
4 . Source of information: Soils Manual M. S. 10 - The Asphalt
institute
Appendix 4
•
-43-
eoc>K927 1849202
• b3 - y7
REQUIREMENTS FOR AEROBIC SEWAGE TREATMENT SYSTEMS
1. EVALUATION OF AN AEROBIC PLANT: Except as otherwise provided in paragraph
8. 4, all aeration plants shall meet the following requirements:
A. Prior to any field performance evaluation of any aeration plant, the
manufacturer or designer of such a plant shall supply to the Board of
Health sufficient evidence, to the satisfaction of the Board of Health,
of the basic feasibility of the plant with respect to its intended
service. As part of the application for performance evaluation of a
particular plant model or model series, the manufacturer shall set
forth the basic description of the plant or model series and design
data including drawings and specifications for the plant and all of
its equipment and appurtenances. The manufacturer shall submit a complete
installation, operation and maintenance manual which includes a thorough dis-
cussion of the process fundamentals involved. All plants shall be tested
by a certified laboratory according to the tests and procedures prescribed
in Standard No. 40 (11/13/70) Section 5 and Section 6 of the National
Sanitarian Foundation, or by equivalent tests and procedures including
the analytical parameters. A copy of the test report shall be supplied
to the Board of Health. All aeration plants shall then be certified
as to the quality of its effluent, which is based upon the analytical
parameter data, and for the method of effluent disposal permitted by
that quality of effluent. No aeration plant shall be installed unless
it shall have been proved capable of meeting the general performance
requirements of these regulations for the effluent disposal method
selected. All aeration plants shall be classified according to their
ability to produce an effluent of the quality as specified in Table 5.1,
under the loading and operating conditions of the required testing
procedures:
Class I Class II
TABLE 5. 1 Maximum Value Maximum Value
Effluent Quality
BOD 5 mg/1 20 60
Suspended Solids, mg/1 40 100
Maximum value not to be exceeded more than 10% of the time.
B. Field Test Qualifications
The Board of Health shall require further qualification of an aeration plant
by field testing of analytical parameters and microbiological requirements
when lack of sufficient evidence of satisfactory field performance exist.
After an approved installation of a plant, the performance of the plant
shall be determined by testing of the effluent as prescribed by the Board
of Health. Plants which fail to meet these requirements shall be removed
from service and any necessary repairs or adjustments made to bring them
into concliance with the requirements of the effluent disposal method used.
APPENDIX 5
-44-
Boos 92; 1849202
b3 - v8
•
Plants which cannot be brought into compliance with the effluent standards
within the time stipulated by the Board of Health shall be considered in
violation of these guidelines and shall be removed from service with the
disposition of the installation determined by the Board of Health provided
for under paragraph 3.14. All costs to the Department involved in the
testing and surveillance of a field qualification test shall be born by
the manufacturer or designer as stipulated in a written agreement with the
Board of Health. All effluent samples shall be analyzed according to the
methods described in the 14th edition of "Standard Methods for the Examina,
tion of Water and Wastewater" as prepared and published by the American
Public Health Associatin, American Waterworks Association and the Water
Pollution Control Federation. The point of sampling shall be that location
after which no additional design feature is credited as part of the treat-
ment process.
C. Material requirements
1. General: Materials used in the construction of individual treatment
plants and component parts shall be capable of withstanding exposure
to the intended use environment.
2. Durability: All materials shall be durable and capable of withstanding
the normal stresses incident to shipping, installing and operation.
3. Dissimilar Materials: Dissimilar materials may be used in mating
parts but shall have galvanic compatibility.
4. Insulating Fittings: Insulating fittings shall be provided when
piping material is used to construct the plant. Such fittings
shall be electrically non-conductive and of a material meeting other
requirements of this regulation.
5. Welding: When weldments are used, the weld area and deposited weld
material, shall meet the applicable corrosion resistent durability
and strength requirements. All welding slag will be removed.
6. Electrical Equipment: All electrical work, equipment and materials
are to comply with the requirements of the 1978 edition of the
National Electric Code. Electrical parts are to be covered by a
manufacturer' s warranty.
7. Mechanical Component Parts: Mechanical component parts are to be
covered by a manufacturer's warranty.
8. Alternate Materials: Variations in materials after initial evaluation
are permissible when they make the equipment equal to or more resistent
to corrosion, wear and physical damage, or if they improve the general
operation and performance of the device. Variations shall be approved
by the Board of Health prior to their use. Where specific materials
are mentioned, it is understood that the use of other materials proved
to be equally satisfactory will be acceptable.
APPENDIX 5
-45-
Boo927 1849202
63 - v9
D. Design and Construction Requirements
1. General: An individual treatment plant shall be designed and
constructed such that the plant component parts, when installed
and operated in accordance with the manufacturer's instructions,
shall not be adversely affected by the normal environment to which
they are subjected. Normal environment shall include vibrations,
shock, climate conditions, and usual household chemicals used. All
component parts shall be free of non-functional rough or sharp
edges, or other hazards which could cause injury to persons ad-
justing or servicing the plant.
2. Indicators of Failure: There shall be a positive and recognizable
indication or .warning to the user that the plant or component thereof
has failed, is not operating or is malfunctioning. This indication
or warning shall be in the form of a visual or audible signal, or
both, which shall be fail-safe.
3. Watertight Integrity: The plant shall be so designed and constructed
that thee -component parts, when installed and operated in accordance
with the manufacturer's instructions, will preclude infiltration
of groundwater and prevent the escape of wastewater or liquids
through other than standard openings.
4. Structural Soundness: Tanks shall withstand earth and hydrostatic
pressures both when full and empty. Completed tanks are to present
a smooth inside finish free of spalls, honeycombs and pits, except
that rough surfaces will be permitted when they are intended to
support biological growths. All metal surfaces are to be properly
coated to prevent corrosion.
5. Accessibility for Inspection and Maintenance: The plant is to be
equipped with a grade level access manhole located so as to permit
periodic physical inspection and maintenance of all component parts
and compartments including but not limited to, submerged bearings,
moving parts, tubes, intakes, slots, filters and other devices.
6. Operation Under Load Conditions : Treatment and discharge devices
shall, when installed and operated in accordance with manufacturer's
instructions, be capable of producing an effluent meeting the physical/
chemical and biological requirements of NSF Standard No. 40 (11/13/70)
for the classification specified on the data plate and shall prevent
the discharge of untreated wastes.
7. Serviceability: Units shall be so designed and constructed that,
when installed in accordance with a manufacturer's recommendations,
they shall be capable of being easily maintained, sarpled, drained,
pumped and cleaned.
8. Energy Requirements.: The manufacturer' s engineering data and litera-
ture shall specify the power requirements to properly operate the
aeration plant or its component parts.
APPENDIX 5
sect,/ 927 1849202
b3- So
9. Parts List: There shall be a comprehensive parts list provided
to the dealer by the manufacturer. The individual parts shall be
listed by a number, a letter or a symbol, and identified on an
illustration, photograph, or a print with the same designation.
10. Instructions: The manufacturer shall provide clear, concise
instructions covering the aeration plant which when followed,
will assure proper installation, safe and satisfactory operation.
11. Warranty: The manufacturer shall provide at least one year warranty
covering all parts and materials.
12. Data Plate: A permanent type plate shall be provided, so inscribed
as to be easily read and understood, and securely attached to the
aeration plant at a location which is normally visible following
recommended installation, or visible under normal servicing. Said
data plate shall include the following:
Name of Manufacturer
Model or Serial Number Designation
Use Capacity of the Unit
Classification
13. Where a final effluent sample cannot be easily obtained from
the discharge end of the effluent outlet, a sampling well
following the aeration plant is required. The sampling well
shall be accessible from the surface of the ground and covered
with a properly secured removable cap.
14. Aeration Compartment:
a. The shape and design of the aeration compartment, its inlet
and outlet arrangements, compartmentation, baffling, and
air application shall:
1) Allow for intimate mixing of applied sewage, return
solids, and applied air.
2) Prevent excessive short circuiting of flow.
3) Prevent the deposition and buildup of solids in any
portion of the aeration compartment.
b. The method of aeration shall be accomplished by mechanical
• aeration, diffused air, or a combination of these. The air
may be applied continuously or intermittently and shall maintain
aerobic conditions in the aeration and settling compartment at
all times. On all systems where the operation is intermittent,
the cycling mechanism is to be sealed or devised so that the
cycle can only be altered by the manufacturer's representative
or a Systems Contractor.
APPENDIX S
-47-
BOOK
92"7 1849202
la3 - Sl
II . INSTALLATION
A. Aeration plants shall be set on a solid base, level, and at the
correct elevation for the design of the effluent disposal system;
and shall be capable of accommodating flow with hydraulic efficiency.
B. Installation of Mechanical Component Parts:
1. Mechanical component parts are to be installed in a properly
vented location and all vents, air intakes, and air hoses
are to be protected from snow, ice or water vapor accumulations.
2. Mechanical component parts installed in or at the aeration
tank are to be protected against damage or impairment of
their efficiency by flooding, foaming or surcharging.
3. Mechanical component parts shall have no requirement for
periodic maintenance or adjustment by the owner, other than
changing a fuse and visual inspection of the warning light.
C. Electrical component parts and aeration plant: All equipment shall
be protected with adequate safety devices such as overload interrupting
devices or fuses.
D. Covers or other protection: All systems installed under these
standards are to include protection of openings against unauthorized
entrance or removal.
III. OPERATION AND MAINTENANCE
A. Replacement Policy: A replacement policy covering all mechanical
and electrical component parts is to be furnished by the manufacturer
to each owner in conformance with the warranty provisions.
B. Initial Service Policy: A two year initial service policy is to be
furnished to the purchaser by the manufacturer or the distributor
through the dealer and to be included in the original installation
costs. This policy is to provide:
1. An inspection and/or service call, at intervals not to exceed
six months, which includes inspection, adjustment and servicing
of the mechanical and electrical component parts so that they
function properly.
2. An effluent quality inspection consisting of a visual check
for color, turbidity, scum overflow, and an examination of
odors . Tests for dissolved oxygen, pH, and suspended solids
should be done if conditions indicate.
APPENDIX 5
-48-
°° 927 1849202
•
lo3 - SR
3. That if any improper operation is observed, which cannot be
corrected at the time, the owner or user is to be notified
immediately in writing of the conditions and the estimated
date of correction.
4. That no charge to policy holders will be made for service
calls and removal or reinstallation of mechanical and electrical
component parts during the specified duration of the service
policy. The cost of service or maintenance resulting from
conditions not attributable to the manufacturer is excluded
from this provision.
C. Continuing Service Policy: A continuing service policy with terms
comparable to the initial two-year policy shall be made available
to all owners or users whose initial policy has expired.
D. Standby Parts: Standby mechanical and electrical component parts
are to be stocked by the local distributor for use when the aeration
plant's mechanical or electrical components must be removed from the
installation site for repairs.
E. Guaranteed Component Parts: The mechanical and electrical component
parts are to be guaranteed against any defects in materials and
workmanship as warranted.
F. Service: Service to be available and in no case is a request for
service to go more than two working days without being fulfilled.
6, Owners Manual: An aeration plant manual is to be supplied to each
owner at the time of installation and is to include the following
information:
1) Method of operation of the aeration plant and mechanical
component parts, including design and flow diagrajns.
2) Warranty.
3) Replacement policy and service policy.
4) Instructions for operation and maintenance.
H, Service Label: A clearly visible, permanently attached label
or plate giving instructions for obtaining service is to be placed
at the warning light or buzzer.
I , Responsibility of User: The user will be responsible for maintaining
and operating the plant in accordance with this regulation and the
manufacturer's specifications, and shall furnish the Department with
proof of proper maintenance and cleaning shall consist of either:
1) The maintaining in force of a continuing service policy from
a Systems Contractor during the time the aerobic sewage disposal
is in use, or
APPENDIX S
-49-
.„ 92'7
1849202
l03 -•
5.3
2, The certification to the Board of Health of effluent
testing results in accordance with paragraph 3. Said
results shall not be deemed certified to the Board
of Health unless and until the fees therefore have
been paid in accordance with paragraph 3. 3D.
J, Noise: All mechanical component parts (compressors, blowers,
aerators) shall be so placed or protected so as not to produce
noise in excess of 60 decibels, "A" scale, at a distance not
to exceed 20 feet from the wastewater treatment plant or
appurtenances.
K. Notice of Failure: The user shall notify the manufacturer's
representative and the Department of any failure of the system
as soon as possible.
IV. GENERAL REQUIREMENTS FOR AEROBIC SEWAGE TREATMENT SYSTEMS ARE AS FOLLOWS:
A. Systems shall be approved only if designed by a Registered Pro-
fessional Engineer in compliance with the construction standards
and performance criteria as set forth in these regulations unless
otherwise excepted.
B, Effluent shall be retained upon the owner's property unless
expressly permitted by the Board of Health to be piped or conveyed
by an approved means to an approved disposal site.
G. Direct discharge of effluent from an aerobic sewage treatment
system uncontained upon the surface of the ground is prohibited
unless satisfactory and sufficient scientific proof is presented
to the Board of Health by the manufacturer or designer that the
effluent from the aeration plant is potentially non-pathogenic or
non-hazardous to humans.
V. TERTIARY TREATMENT OF EFFLUENT FROM AERATION PLANTS MAY UTILIZE THE
FOLLOWING METHODS TO ENHANCE EFFLUENT QUALITY:
A. Effluent may be improved in quality by passage through a filter
which has been designed by a Registered Professional Engineer,
with the design criteria having been approved by the Board of
Health. Aeration plants which employ filtration as a design unit
upon which their effluent performance qualification is determined,
shall not be installed without the filter. Construction, design,
and performance data of the proposed filter shall be presented to
the Board of Health for its review and approval.
B, Sealed stabilization ponds may be used for effluent treatment if
designed by a Registered Professional Engineer, and which has at
least a 30-day retention time.
APPENDIX 5
-Sc-
BC' 927 1849202
1o3 - SW
C. Other tertiary treatment methods may be proposed by a
Registered Professional Engineer upon the submission of
satisfactory and sufficient data of the method to the Board
of Health for its review and approval.
VI, DISPOSAL OF EFFLUENT BY DISPERSAL SYSTEMS:
A, By contained surface discharge: Stabilization ponds, which are
sealed and non-discharging may be approved provided:
1. That they are designed by a Registered Professional Engineer.
2. Have sufficient retention capacity to provide for adequate
evaporation.
3. Are properly fenced so as not to provide an attractive
nuisance or safety hazard.
4. Are not located within a subdivision except by permit by
the Board of Health.
5. Meet the effluent quality requirements of a Class I aeration
unit.
B. Discharge beneath the surface of the ground is prohibited for
dispersal systems.
VII. If the discharge is made into an absorption system, the effluent at the
point of sampling shall not exceed the requirements of a Class II aeration
plant; however, the absorption system need not be designed by a Registered
Professional Engineer if paragraph 5.4 is followed. The absorption area
may be reduced from that required in paragraph 5. 4 provided that adequate
and sufficient data is submitted by the designer to the Board of Health
supporting the design criteria of greater hydraulic loading with satis-
factory effluent dispersal. An area reduction of a standard absorption
field will be permitted for approved aeration plants, without submission
of additional research data, as provided in Table 5.2 below:
TABLE 5.2
Size of Dispersal Field as
Percentage of Standard Absorption Area
Percolation Rate
5-30 min. 31-60 min.
per inch per inch
Class I Effluent 60% 67%
Class II Effluent 67% 75%
APPENDIX 5
-51-
BOOK 927
1849202
b3 - ss-
NATIONAL SANITATION, FOUNDATION STANDARD
FOR
INDIVIDUAL AEROBIC WASTEWATER TREATMENT PLANTS
SECTION 1- GENERAL PROVISIONS safet
y and user agencies or groups. Final
COVERAGE: This standard covers plants adoption of revisions shall be, in accord-
1.0
for the treatment of wastewater from in• thean SwF J the procedures established by
er
dividual homes and other sources having Technology.NSF Joint Committee on Wastewater
similar types
and volumes of liquid
wastes. The plant shall include those ap-
purtenances or attachments thereto that SECTION 2. DEFINITIONS
are nocossary for its proper function or
which modify its operation or function. • GENERAL
Disposal of treated effluent from these
plants is not included in the scope of this 2.1 COMPONENT PARTS: All physical,
standard. mechanical and electrical components of
1.1 MINIMUM REOUIREMENTS: Those re- the plant.
quirements for individual aerobic waste- 2.2 DISSOLVED OXYGEN (DO): The oxygen
water treatment plants are established as
dissolved in wastewater, expressed as
a guide for the evaluation of plants cov- milligrams per liter (mg/1),
eyed herein and are considered to be
basic and minimum. Variations aro per- 2.3 FIVE-DAY BIOCHEMICAL OXYGEN DE•
miscible when they make the treatment MAND (BODe):
plant at least equally resistant to corro- The quantity x ti oxygen
lion, wear and physical damage: and if used in ailth biochemicalfiv days oxidation n of err
g genic matter in five al 20° C under
they provide for equal or boner opera lion specified conditions, expressed as mil-
and performance, variations shall be ac- ligrams per liter (mg/I).
ceptud prior to their use. Plants which
2.4 PLANT: Equipment or devices in their en•
have components or parts which are cov•
erod under existing NSF standards shall
uidu for treating wastewater sources
from wing
cumply with the applicable requirements. vidual homes or other sources having
similar types and volumes of liquid
•
1.2 ALTERNATE MATERIALS:Whenever wastes.
specific materials are referenced, it is un- 2.5 SETTLEABLE SOLIDS: Solids in the
derstood that the use of materials shown
wastewater which will settle, as distinct
o be equally satisfactory may be per- from remaining in suspension, after 30
mined. Proposed variations in materials minutes of settling
after the initial evaluation shall be sub- millilit time, expressed as
mined to the testing agency prior to their ers per liter (mI/I).
use and, if approved, aro permitted. 2.6 SUSPENDED SOLIDS (SS) OR NONFIL-
1.3 REVIEWS AND REVISIONS: A cam faro TERABLE RESIDUE: Solids in the waste-
P water that can be removed readily in a
review of the standard shall be conducted
at intervals of not more than five years to laboratory esby standard rms pricer
dures, expressed as milligrams per liter
determine what changes, deletions or (mg/11
additions, it any, are necessary to mnin-
tein currant and effective requirements 2.7 VOLATILE SUSPENDED SOLIDS (VSS):
consistent with now technology. Those The quantity of solids in wastewater
reviews shall be conducted by appro- which are lost on ignition of the dry sus-
prime representatives from public health, pended solids at 550°C = 50°C,expressed
water quality management, industry, as percent of total suspended solids.
APPENDIX 6
- —52—
92'71849202
••
63 - s6
2.8 WASTEWATER: All human,body wastes the plant and component parts, when in-
and other wastewater produced in a - stalled and operated in accordance with
household, or liquid wastes with similar the rnanulaciwor's instructions, shall not
char actor istics. he adversely affected by the normal en-
•
vironment to which they are subjected.
Normal environment shall include vibra-
tion, shock,climate conditions and typical
household chemicals used. All compo-
SECTION 3. MATERIALS neat parts shall be free of nonfunctional
rough or sharp edges or other hazards
3.0 GENERAL: Materials used in the con-
structiun of individual ueatmentplants whch could cause injury to persons ad•
justing or servicing the plant.
and component parts shall be capable of
withstanding exposure to the intended 4.1 INDICATORS OF FAILURE: There shall be
•
use environment. a positive and recognizable indication or
warning to the user that the plant or corn-
3.1 DURABILITY: All materials shall be dura-
ble and capable of withstanding the • orie thereof has failed, is not operating
• nor- m or is malfunctioning. Reference to failure mel stresses incident to shipping, instal- refers to electrical and mechanical as-
lation and operation. peels of plant or component and does not
3.2 DISSIMILAR MATERIALS: Dissimilar relate to performance failure or malfunc-
ion. This indication of warning shall be in
rnatorials may be used in mating parts the form of a visual or audible signal or
but shall have galvanic compatibility. both.
3.3 INSULATING FIUTIN'GS: Insulating fit- 4.2 WATERTIGHT INTEGRITY: The plant
rings shall bo provided when piping shall be so designed and constructed that
material is not compatible on the elec-
tromotive scale with material used to the component parts, when installed and
construct the plant. Such fittin s shall be operated in accordance with the man•
9ulacturer s instructions, will preclude in-
electrically nonconducti\ e and of a mate- filtration of groundwater and prevent the
riot meeting the other requirements of
escape of wastewater or liquids through
This standard. other than standard openings designed
for this purpose.
3.4 WELDING: When weidntents are used,
the weld area and deposited weld mate- 4.3 STRUCTURAL SOUNDNESS: Tanks shall
dal shall meet the applicable corrosion not resistant durability and strength re- earth iapseorrupturewhensubjectedei to
er
9 earth and hydrostatic pressures either
quirements- All welding slag shall be re- when full or em
moved. (See Items 3.0 and 3.2) e Pty. Complete tanks shall•
present a smooth inside finish free of
3.5 ELECTRICAL EQUIPMENT: All electrical spalls, honeycombs and pits, except that
work, equipment and materials shall rough surfaces shall support pp bio when
comply with the requirements of the they are i ll metalended ut as sh biological
prop-
current a edition of the National Electrical growths. All metal surfaces shot .Code and other aplicabla standards, erly coated to prevent corrosion.
Electrical component parts shall be coy- 4.4 ACCESSIBILITY FOR INSPECTION AND
erod by manufacturer's limited warranty. MAINTENANCE: Th
(Soo horn 7.0 and Appendix B) e plant shall be
equipped with ono or more grade level
3.6 MECHANICAL COMPONENT PARTS: access manholes located so as to permit
periomainte-
Mechanical component pails shall be co- nonce ofc component physicel inspection and to a6
voreel-by manufacturer's limited war- nonce pans subject ant c a •
month normal inspection cycle and eom�rant-y. (Sue Item 7.0 and Appendix 8)
parimonts including, but not limited to,
submerged bearings, moving parts,
tubes, intakes, slots, filters and other de•
SECTION 4. DESIGN AND CONSTRUCTION vices,
vices.
•
4.0 GENERAL: An individual treatment plant 4.5 O'E..,, TION UNDER
shall be designed and constructed so that TIONS. Treatment and discharge
CONDI-
shall
devi es
APPENDIX 6
-53-
929 1849202
63 - a7
shall, when installed and operated in accor• shall he provided, so inscribed as to be
dance with manufacturer's instructions, be easily road and understood, and securely
capable of producing an effluent meeting the , attached to the plant at a location which is
physical, chemical and biological require- normally visible following recommended
monts of this standard for the classification installation, or visible under normal ser•
specified on the data plate and prevent the vicing. Said data plate shall include the
discharge of untreated wastes. following:
4.6 SERVICEABILITY: Plants shall be de- -4.11.1 Name of manufacturer
signed and constructed so that, when in-
stalled in accordance with manufac- 4.11.2 Model or serial number designa-
turer's recommendations, Ihoy shall he lion
capable of being easily maintained, sam-
plod, drained, pumped and cleaned. 4.11,3 Rated daily capacity of the plant
(see Item 5.2)
4,7 ENERGY REQUIREMENTS: The man-
ufacturer's engineering data end litera- 4,11.4 Classification (see Item 6.0)
turo shall specify the power requirements
to properly operate the plant and its com •
-
I ponont pans. SECTION 5. STANDARD PERFORMANCE
4.8 PARTS LIST: There shall be a com- EVALUATION METHOD
prehensive pans list provided to the 5.0 PREOUALIFICATION; As part of the ap-
dealer by the manufacturer. The indi- placation for performance evaluation of a
vidual pans shad be listed by number, panicular plant model or model series,
loner or symbol, and identified on an il• the manufacturer shall submit a basic de-
lustretion, photograph or print with the scription of the plant or model series, de-
same designation. sign data including drawings and spocifi-
a,9 INSTRUCTIONS: The manufacturer shall cations for
the plant and all of its equip-
mem andppurtenances, and a complete
provide clear, concise instructions cov• installation, operation and maintenance
Bring the plant which, when followed, will manual which includes a thorough dis-
assure proper installation and safe end cession of the process fundamentals in-
satisfactory operation. volvecl.
4.10 LIMITED WARRANTY: The manufacturer 5.1 GENERAL TEST CONDITIONS AND RE-
shall provide at least a two year limited PORTING: The evaluation analysis pro-
• warranty from date of installation cover- gram shown in Table I shall be followed in
ing all pans and materials. See Sample the evaluation of each treatment plant.
Limited Warranty in Appendix B. (See Tests shall be conducted for a minimum
also Items 3.5, 3.6 and 7.0) of six months.All samples shall be col-
lected and analyzed on a five days per
4.11 DATA PLATE: A permanent type plate week basis.
TABLE I
Volatile
Suspended Suspended Settleable
Type of Frequency DO BOD. Solids Solids Solids Temp.
Sample location Sample of Test moll n-igll 1551, mgrl IVSSI. % rnli30 min. °C
pH
24 hr. _ -. .._, -.
Raw LJluent cornposiru• Daily X X X X X
- -. -.
Fine, 24 hr.
Effluent composite• Daily X X X X
-
Aerator Grab Daily X X X X X•
X
.See Rom 5.6.3
RFP[NDIX 6
-54-
_. - 927 1184920_2
5.2 LOADING. (MANUFACTURER'S DE- ses or defects and failures of its process�
SIGN): During the performance ovtllua- support equipment, noted during the
tion, the plant shall be hydraulically test, shall be included as a pan of the test
loaded at its rated daily capacity' ac- results.
cording to the. following pattern of flow:
5.? MODEL SERIES: For a series of plants of
6 a.m. — 9 a.m. 35% of total daily the same model which vary in rated
flow Ircatment capacities between 400 and
11 a.m. — 2 p.m. 25% of total daily 1500 gallons per day, the results achieved
flow by the smallest plant in the model series
5 p.m. — 8 p.m. 40% of total daily shall be taken as indicative of the
flow capabilities of all other plants in the
series, provided that the basic design'
5.3 METHODOLOGY: All sample collections and configuration of the plant tested are
and analytical methods employed shall not changed for larger capacity plants.
be those set forth in the 14th Edition of • •
Standard Methods for the Examination of 5.8 STARTUP. PERFORMANCE SPECIFICA•
Water and Wastewater, published by the TI0NS AND PROCEDURES: The plant
American Public Health Association, ox• shall be completely assembled according
cept as may be otherwise provided to the manufacturer's directions and all of .
heroin. its equipment checked by the manufac-
• tutor to determine that it is free of
5.4 OPERATION, INSTALLATION AND mechanical defects and operable. The
MAINTENANCE: During the test period plant shall be examined to determine that
the plant shall be installed, operated and it is structurally sound. All defects shall be
maintained according to the manufac- reported. If no delects are detected, this
turer's instructions, except as these may fact shall be indicated by the testing
in an ' way be in conflict with the provi• agency.
sions of the Standard Performance
Evaluation Method, in which case, the 5.8.1 If no defects are detected and the
provisions of the Method shall be corn- plant is judged to be structurally
plied with. sound, it shall be filled with water.
Sampling and testing shall begin
5.5 TESTING SEASON:The Standard Per- as soon as the plant is filled and
lormance Evaluation Method can be car. placed into operation and shall
lied out at any time of the year,pi ovded continue without interruption until
that, if the test is conducted during cold the end of the Standard Perior-
weat¢1er, the plant and its equipment are . mance Evaluation.
•
protected from freezing. If the test is con-
ducted under warm weather conditions, 5.8.2 The wastewater utilized as feed for
the temperature of the aeration coin- the unit shall he raw wastewater of
penmen' contents shall at no time during reasonably typical domestic
the test period exceed 30" C (86° F). . character.
5.6 DESIGN AND CONSTRUCTION: The 5.8.3 The daily composite sample shall
performance evaluation of a plant shall consist of flow proportional sam•
be independent of its design and con- pies collected at least once per
struction except that structural weaknes- hour during the periods of influent
flow.
'Rated daily capacity is the design treatment capacity 01
the plant. Howevei.ipluese note the example below: 5.8.4 The daily influent and effluent
composites shall be subjected to
t matt Ottaelino at Design Loading
laboratory I analyses as specified in
Assume Ave. pe Femity 5 per wns ry y
and average water use v 50 gelyrpersonlday Table i, Item 5.1.
Then daily household waste • 250 pod
The.done letting Si r etad dally capacity provides 5.9 STRESS TES1 IN
greeter IOooinp 10 punt then evolve family might be G'. Stress tualus shall be
a.p�N to contribute. conducted to simulate actual use as de-
It-nu nimumplant sire ICOdal •• 500 gpd scribed in Appendix A. The situations in-
Then Design Leading Simulates'
Use by 10 pen eons Dm 50 patx'per sOnrday or —. ____
Use by 5 person. (ii 100 v a iiJpor sonlday or 'BDS1C design is 6nutpraned to moon the actual deal n f
E Ouiva lent the plant levotl 0 0
t
APPENDIX 6
_55_
927 •
1849202
• fo3 -59
. elude wosh day, working mother, equip-
6.0.1.1 8OO5 and suspended sob men( or power failure and- return from idsP
one week vocation plus shock loading
typical of return horn vacation. • Arithmetic moan of all
• effluent samples collected
5.9.1 Samples collected during each
l
stressing sequence shall include 24 live'a period of days s 30 milligrams coacu-
hou,r composites of the influent per liter and z 8 b5 pet
- and effluent (per Item 5.8.3) col- 5 percent
lectod immediately before and removal.
each 24 hours for sovun days fol• • Arithmetic mean of all
lowing the special dosing require- effluent samples collected
mom and daily .aeration chamber in
grab samples. Analysis shall be in tiee' period of J consacu-
accordance with Table I (Item 5.11. p days 45 milligrams
per filer.
5.10 REPORTS: The manufacturer shall obtain • 6.0.1.2 pH
from the testing agency a report provid-
ing significant data showing the test re- • Effluent values shall to•-
sults on the plant tasted in accordance main-between the limits of
• with NSF Standard No. 40. Appropriate 6.0 and 9.0.
commentary shall also be provided.
6.0.2 Effluent shall be tested three times
during the six months period of
SECTION 6. EFFLUENT REQUIREMENT evaluation Ior color, odor, oily film
and foam. The effluent shall be di•
6.0 EFFLUENT QUALITY: Plants shall be ed 1:1000 with distilled water.
cfatsified according to their ability to Plants listed for Class effluent
produce an effluent of the quality as characteristics shall not exceed the
specified in Table 11 under loading and following limits'.
operating conditions set fonh in Items 5.2
and 6.1. 6.0.2.1 Color — 15 units
6.0.1 Plants listed for Class I effluent 6.0.2.2 Threshold Odor — nom
must also be shown to meet EPA offensive
•
Secondary Treatment Guidelinesp
specified for SOD. and suspended 6.0.2.3 Oily Film — nonvisible
solids and pH. These are as fol- evidence other than air
lows: bubbles
6.0.2.4 Foam — none
•
TABLE II
•
PLANT CLASSIFICATIONS
•
Effluent Oueliry Class I Class II
Maximum Value" Maximum Value"
SOD., mg/l 20 60
•
Suspended Solids. mgd 40 100
"Maximum vuluo not 10 be excooCed mere man 10`:'e of the Imu
3Feeerer Royieret, Vol_ 3a. No 159— FJoey, Au^y.vst '7
1975 Title 40— Protection or Envncnmenl, hnap'or
1 — CPA, Suacesprer D— Witter Pro sums, Pert 133—
Sacondlry Ti ea(icon( Intor.metionn horn 133.102 — 'Fre Srnndnrtt Nn, 40 appIcnrlon, coruccu1,ve days chNi
Secondary Tte a tmeer.
ho rnterprntod V: fontefutive .nmplrn9 Von.
APPENDIX 6
-55-
• ' BOOR 92,7 •
1849202
(03 -6o
6.1 STRESS TESTING REQUIREMENTS: On I'ihl;lable 10 the manufacturer's
composite samples collected for !lie piocluri or the installation Of same,
period beginning 24 hours following shall he excluded from this provi•
completion of each sit ossing condition :.ion. '
(as described in Item 5.9:and Appendix A),
• measured values for DOD, and SS shall
not exceed the performance limit 7.2 CONTINUING SERVICE POLICY: A con-
specified for Class II (i e.. SOD: t 60 mg/I tinuinservice
and SS s 100 mgrif. g policy with terms com-
parable to the initial two year policy shall
he made available for purchase by all
owners whose initial policy has expired.
7.3 STANDBY PARTS: Standby mechanical
SECTION 7.OPERATION AND MAINTENANCE and electrical component pans shall he
-stocked by the local distributor for use
7.0 REPLACEMENT POLICY: A replacement when the plant's mechanical or electrical
policy covering all mechanical and oleo- coniponents must be temoverf from the
trical component parts shall be furnished instnilncinn site for lepailc
by the manufacturer to each owner.
• Suggested limited warranty provisions 7.4 GUARANTEED COMPONENT PARTS:
are shown in Appendix B. The mechanical and electrical compo-
mutt parts shall he guaranteed against
7.1 INITIAL SERVICE POLICY' A two year ini•
any drfecls in materials and workman.
lial service policy shall be lotnislted to the ship as warranted (Item 4.1). The cost of
purchaser by the manufaclurer or the ieI,Inc Inc; damagr:d component parts, not
distributor through tYe dealer and Le in- due to reasonable wear and tear, is
eluded in the original purchase price. This excluded from this provision.
policy shall provide:
•
7.5 SERVICE : Service shall be available
1.1.1 Fot inspoctionise.rvice call, at inter- within no root P. than iwn working days
vals not Io exceed six months, following a request.
which includes inspection, ad-
justment and servicing of the 7.6 OWNER'S MANUAL: A manual shall he
•
mechanical and electrical compo- supplied to each owner al the iime of in.
nent parts ro ensue that they lunc. slrnlllninn nnif include the following in-
lion properly. formation:
7.1.2 rem an effluent quality inspection '/ 6 1 Meil,od of Operation of the plant
consisting of a visual check for find mechanical component pans,
color, turbidity, :cum overflow and including design and flow diag-
an examination for odors. tains
7.1.3 That if any improper operation is 7.6.2 !.united warranty
observed, which cannot be cor•
reeled at that time, the owner shall 7.6.?, Replacement policy and service
be notified immediately in writing policy
of the conditions anrf the estimated
data of correction. 7.6.4 Instructions for operation and
main)Chance
7.1.4 That no charge to policy hoidens
shall be made for service call; and 7.7 SERVICE LABEL: A clearly visible, per-
labor for removal or lei: :oallation momently ;il:.tchr-cf lahai or pitta j)Iving
Of mechanical and elect,ICI: COm- imt uu:tionc for obtaining service shall be
ponent pans Ouoino toe ap.rtcilied pi ckr,l at tl'.r vrJ nliui figll or brute,.
duration of the se:vin.e policy -i he
cost of service of maintenance re- 7.& HESI'l"NSIRll111' OF USES: 'fhe u':er
selling from col:Ebbw-b., not a:. shall Lr• rh'.lu',nt:ilitt. for rna:Miunirra and
APPENDIX 6 •
7-
BOOK 1849202 •
927 63 -6/
operating the plant in accordance with - 81.3 Mechanical component parts shall
regulatory agency's and manufactul( r's have no requirement for periodic
specifications. maintenance or adjustment by the
7.9 NOISE: All mechanical component pans and
other than changing a fuse
and visual inspection of the warn-
(compressors. blowers, aerators) shall be ing light.placed or protected so as not to produce
noise in excess of 50 decibels, "A" scale, 8.2 El ECTRICAL COMPONENT-PARTS AND
at a distance not to exceed 20 feet hum PLANT: All equipment shall be protected
the plant or oppunononcos. with adequate safety devices such as
overload interrupting devices or fuses
• and meet appropriate National Electrical
SECTION 8. SAFETY Manufacturers Association (NEMA)
and/or 8.0 GENERAL: Individual aerobic wastewater requirements.dwr+tars Laboratories (UL)
r
treatment plants shall be designed and
constructed so as not to adversely affect 8.3 COVERS OR OTHER PROTECTION: All
the area or the occupants thereof. plants installed under these standards
shall include protection of openings
8.1 INSTALLATION OF MECHANICAL COM- against unauthorized entrance or ro•
PONENT PARTS: rnoval.
•
8.1.1 Mechanical component pans shall 8.3.1 Acceptable protection of openings
be installed in a properly vented shall include:
• location -and all vents, air intakes
.and air hoses protected from snow, 8.3.1.1 Padlock
•
ice or water vapor accumulations.
8.3.1.2 "O" ring, twist lock cover
8.1.2 Mechanical component parts in-
stalled in or at the tank shall be requiring special tools (or
removal
protected against damage or irn•
pairrnent of their efficiency by 8.3.1.3 Weighted coves not less
flooding, foaming or surchar ging. than 65 pounds not weight.
4.1
APPENDIX 6
-58-
BOOK 1849202
927 493 - 6A
•
POLICY C - NATIONAL SANITATION FOUNDATION STATEMENT OF POLICY RELATING
TO TESTING AND TEST REPORTS
• Testing
Examination Actual NSF examination of an individual aerobic waste-
water treatment plant is required before the right to use
the NSF seal on such product is initially granted.
Supplementary Materials
Material The following materials shall be submitted for consideration
to be under the provisions of the standard. Each is cited to .
Submitted the standard for convenient reference. Those listed in •
Group 1 must be submitted prior to testing; those listed
in Group 2 shall be submitted as soon as possible. No
listing shall be provided in the absence of the required
supplementary materials .
Group I
• a . Sales brochure
b. Basic description of process and design data , in-
cluding drawing and specifications
c. Instructions for installation , operation and maintenance
Group 2
d . Owner ' s manual for installation , operation , mainte-
nance and process fundamentals
e . Parts list , with illustration
f . Data plate facsimile
g . Warranty
h. Replacement policy
Service policy and continuation
j . iStandy parts policy
k, Parts guarantee
1 . Service provisions and identification
APPENDIX 6:
-59-
BOOK 18492.02
927 6,3-63
POLICY C, NATIONAL SANTIATICII FOUNDATION , continued
Test Reports
Preliminary 1 . During the performance evaluation period , NSF shall
Reports 1,ruviJo nun ufacturur with w,: ekly , written , prelimi -
nary repOil ., Of lai'uintory da: a . These reports shall
not he used by manufacturer for any purpose out of
context with entire data supplement , developed at the
completion of the testing program.
Test 2 . A report summarizing. the test results shall be pro-
vided to each manufacturer .
Correction 3. Violations cited during inspection of manufacturing
of or distributor ' s facilities shall be corrected within
Violations 30 days or as mutually agreed upon by the manufacturer
and NSF .
•
APPENDIX 6
-60-
polite NU77CE
IRRSTREADING
ORBIIWTCE NO.9-A_
IN THE MATTER OF THE
REPEAL A1ND RE-ENACT-
NI NT 4V1Tfi AMENDMENTS AFFIDAVIT OF PUBLICATION
ORDINANCE NO. 8
FR0CERNING THE ADOPTtONOUNFg
R NDIIVIID AND UALUSLEd AGE'
DISPOSAL SYSTEMS IN
WELD COUNTY. THE JOHNSTOWN BREEZE
8 IT ORDAINED $$Y'THE
STATE OF COLORADO )
BOARD OF COUNT%COMMIS, ) SS
SCOLORADO:
DO WELD CCOOUNT- COUNTY OF WELD )
WHEREAS Ordinance No. e, I, Clyde Briggs, do solemnly swear that I
an Ordinance containing am publisher of The Johnstown Breeze;
changes and amendments to the
Weld County Individual Sewage -that the same is a weekly newspaper
Disposal System Regulations
w�paesa ppevfe 1 passed and printed, in whole or in part, and published
1877,anon°'° 'day of June, in the County of Weld, State of Colorado,
"pu and has a general circulation therein; that
provisions of WHEREAS._ M said newspaper has been published
$ inty of Weld amended,requiredt�o continuously and uninterruptedly in said
adopt rules and regulations County of Weld for a
concerning Individual sewage
period of more than
afs al systems in the County fifty-two consecutive weeks- prior to the
of Weld, andfirst publication of the annexed legal notice
Board of Hearth has rreecotny or advertisement; that said newspaper has
Mended the ado tion of a been admitted to the United States mails as
comprehensive revision of said
cute..and regulations,-and - second-class matter under the provisions of
WEAmnffsefee Boaa`d of the Act of March 3, 1879, or any
C of Weld, State of amendments thereof, and that said
Colorado,desired torepeal sad - newspaper is a weekly newspaper duly
re-enact with amendments Ord- news a er
inance No.9for the benefits the qualified for publishing legal notices and
inhabitants of Weld heir safety,
end advertisements within the meaning of the
for the tsofpromotion of Their County and
welfare, convenience and pros- laws of the State of Colorado.
perity.
xow THEREFORE BE IT That the annexed legal notice or advertise-
ORDAINED by the- Board of ment was published in the regular and
County,Commissioners of Weld entire issue of every number of said weekly
ance No. ..previously viously enacted
be,and hereby is,repealed and newspaper for the period of ..t.. consecu-
re-enactedwith amendments to tive insertions; and that the first
read asc�set n�form in Exhibit A,
weld Cs untr Individual Sew- publication of said noticgwas in the issue of
age Df System Regina-
[Cone " a copcy of which is said newspaper dated-4..1U., A.D. 191V..,
attached hereto and incorpor-
ated herein by reference. and that the last publication of said notice
The effective date of this was in the issue of said newspaper dated
Ordinance shall be forty-five , A.D. 19
fee dpye.. _ "the.fmalpublica-
on of Ws ce. In witness whereof I have hereunto set
The above and foregoing my hand this ....2.2_day of — -I
Ordinance No. 9-A was, on A.D. 19.fr'1
motion duly made and seconded,
opted bythe fonowing vote on
A.D.. 1961 ,,p,A-Rpp �(//�( //"�`�
t76M1D88IONNERtS / /
�'ir) D CR / Publisher
.- , Subscribed and sworn to before me, a
Notary Public in and for the County of
Weld;State of Colorado, this 2L,.(. day of
ATTEST: 4-G z -•
. A.D. 19. /
Weld County Clerk /4-1.7‘..-.
:72
and Recorder and % /
Clerk to the Board
By: :.Z.'c.✓s SZ,i:! l `
Deputy County Clerk • Notary Public.
APPROVED AS TO FORM:
County Attorney �//
/DATE PRESENTED: January My commission expires 1,e"- . ...' :`).'
DA99T8I
E PUBLISHED: January
15, 1981
in the Johnstown Breeze
Co Legal 81.12-Clerk to Board
.r—
Hello